Month: October 2003

VFS and ports for maintainers


Matt Dillon explained what he wants the port-creation experience to be for a port maintainer, using VFS, quoted below:
More…

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FXR created


Hiten Pandya mentioned that Robert Watson has set up the FXR website (FreeBSD/Linux Cross Reference) for BSD code. It’s a personal domain, so please don’t tax it at present.

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The SMP path not taken


Greg Lehey put up a paper and slides from his Singapore presentation, describing the FreeBSD-5 SMPng work, both in terms of events and code. It’s an interesting read, since this is the path avoided in DragonFly. (Greg Lehey has a 2001 USENIX paper on SMPng, too, which mentions much of the same content.)

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Make release unbroken


Jeroen Ruigrok has fixed make release.

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Flames bad, info good


On the freebsd-hackers mailing list, a slight flamewar erupted over discussion of checkpointing code from DragonFly. Amidst the dumbness that normally ensues in a flamewar, there’s some interesting descriptions on what work has been done/will be done on DragonFly. Check out the archive, mostly in the “FreeBSD mail list etiquette” thread. Matt Dillon’s posts here, here, and here are all info-packed.

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Berkley talk slides up


Matt Dillon’s posted his slides from his talk at UCB Berkley, in OpenOffice format.

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FreeBSD 5.1 and DragonFly disk sharing


As part of another discussion, it’s been noted that trying to boot FreeBSD 5.1 and DragonFly from the same disk currently may not work if it’s UFS1, and definitely won’t if it’s UFS2.

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Checkpointing links


Jeroen Ruigrok posted some links to papers about checkpointing and threads:

A User-level Checkpointing Library for POSIX Threads Programs:
http://citeseer.nj.nec.com/james99userlevel.html

Checkpointing and its applications:
http://citeseer.nj.nec.com/wang95checkpointing.html

Migratory applications:
http://citeseer.nj.nec.com/bharat95migratory.html

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New site layout


The main DragonFly site has been fixed up, in part with some changes I’ve submitted. Whee! I contributed!

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ATAng discussion


Kip Macy brought up the idea of moving FreeBSD’s ataNG into DragonFly; the consensus so far is to bring it in separately from the existing ata support, since ataNG’s not yet completely stable.

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Matt Dillon at UCBerkley


Thursday October 23, 306 Soda Hall 6 – 8 PM. Matt Dillon will be talking to whomever shows up to the CSUA meeting.

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Futexes in the future


Hiten Pandya brought up futexes for possible inclusion in DragonFly, pointing at this page for reference.

Bill Huey brought up http://people.redhat.com/drepper/futex.pdf, with the caveat that futexes are used for 1:1 threading models, not M:N models such as DragonFly is using/will be using.

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Routing reading


Jeroen Ruigrok posted a whole pile of links to routing information for anyone wanting to work on it:

Basics:

TCP Vegas: End to End Congestion Avoidance on a Global Internet
http://citeseer.nj.nec.com/brakmo95tcp.html

Evaluation of TCP Vegas: Emulation and Experiment
http://citeseer.nj.nec.com/ahn95evaluation.html

TCP and Successive Fast Retransmits
http://citeseer.nj.nec.com/floyd95tcp.html

Congestion Avoidance and Control
http://citeseer.nj.nec.com/jacobson88congestion.html

Performance Problems in BSD4.4 TCP
http://citeseer.nj.nec.com/brakmo95performance.html

Comparison of Tahoe, Reno, and SACK
http://citeseer.nj.nec.com/fall95comparisons.html

TCP Vegas: New Techniques for Congestion Detection and Avoidance
http://citeseer.nj.nec.com/brakmo94tcp.html

A Tree-based Packet Routing Table for Berkeley Unix
http://www.cs.berkeley.edu/~sklower/routing.ps

Newer:

TCP Vegas Revisited
http://citeseer.nj.nec.com/hengartner00tcp.html

Analysis on TCP Vegas and TCP Reno
http://citeseer.nj.nec.com/hellal00analysis.html

Scalable Timers for Soft State Protocols
http://citeseer.nj.nec.com/48810.html

End-to-End Internet Packet Dynamics
http://citeseer.nj.nec.com/paxson97endtoend.html

End-to-End Routing Behavior in the Internet
http://citeseer.nj.nec.com/3573.html

Routing with a Clue
http://citeseer.nj.nec.com/afek99routing.html

IP Lookups using Multiway and Multicolumn Search
http://citeseer.nj.nec.com/lampson98ip.html

Fast and Scalable Layer Four Switching
http://citeseer.nj.nec.com/srinivasan98fast.html

High-Speed Policy-based Packet Forwarding Using Efficient
Multi-dimensional Range Matching
http://citeseer.nj.nec.com/lakshman98highspeed.html

Fast Address Lookups using Controlled Prefix Expansion
http://citeseer.nj.nec.com/srinivasan99fast.html

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Site diary update


Matt Dillon’s made a diary update.

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Slab, multicast, sysinstall, SysV


The memory slab allocator is now on by default, and the old system is gone.

Man pages for pim(4) and multicast(4) for “Protocol Independent Multicasting”, are in.

Sysinstall has been modified with changes for NFS; you can pick NFSv3 (default) and TCP protocol (not default), now, along with some internal changes.

The SysV IPC regression test suite has been added, in src/tools/regression/

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Compatibility cleanup stats


David P. Reese posted his 9th step into syscall separation, and noted that there remains:


  • “37 more uses of stackgap allocations in the linux emulation code”
  • “26 more 43bsd syscalls that require relocation”

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Checkpointing is in


Kip Macy’s checkpointing code has been committed; I’m pasting Matt Dillon’s post about it as there’s a lot of issues to consider.

For those of you late to the party, checkpointing allows you to “freeze” a copy of an application so that, in theory, you can restore the program to that running state at a later point in time. Useful, for instance, if you have a program that takes a long time to complete and you don’t want to have to restart from the beginning if there’s an interruption.
More…

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Doxygen don’t


David Cuthbert brought up the idea of Doxygen headers for the source; Matt Dillon didn’t care for the idea, pointing at this for an example. Hiten Pandya noted that he’d like to have a separate by-hand handbook, for which Eirik Nygaard posted a possible example. Matthew Fuller added that he is working on a SGML application for library documentation as part of another project.

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wmake


While noting that he has made a number of changes to the scheduler, Matt Dillon described a new tool called ‘wmake’. wmake allows you to run make in a subdirectory simulating a buildworld environment, without actually having to build world.

(quoted from his post, using libkvm for an example:)
cd /usr/lib/libkvm
wmake obj
wmake
make install

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Routing engine description


Joshua Coombs has an extensive writeup of his ideas for routing, located at http://www.outofspec.com/routing/

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How to profile


While talking about something else, Hiten Pandya mentioned the steps necessary to turn on profiling, to help catch bugs. I’ve saved the steps here, in case they are useful…
More…

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Bootsplash loader and gzip


Emiel Kollof noted that it would be nice if the splash screen loaders could read gzipped files, so that any splash screens could be stored in a compressed format and still used. Hiten Pandya pointed at kern/imgact_gzip.c and boot/i386/kgzldr/boot.c for examples, if anyone wants to tackle this project.

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/bin/sh fixed


/bin/sh had a big introduced recently that would make it crash when booting with a new world. It’s been fixed, so recompile /bin/sh with updated sources when possible.

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Plan 9 namespaces


David Leimbach noted that Ron Minnich was porting Plan 9 namespaces to FreeBSD, which duplicates some of the security features to be covered by VFS. Ron Minnich’s web page has more data on this and other technologies.

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Emiel’s Eye Candy


usr/share/examples/splash has been committed. This is the logo screen Emiel Kollof made from the DragonFly logo.

Emiel Kollof’s also got the NVIDIA binary video driver working; it should show up in dfports.

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amr(4) driver patch


Hiten Pandya (hmp@backplane.com) is looking for anyone using a AMI MegaRAID card, who is willing to test a patch for FreeBSD-4/DragonFly.

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vmware2 in dfports


dfports/emulators/vmware2 is in, though Matt Dillon warns that it is not yet functional.

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Added fsx, fdisk option


File System Exerciser, in tools/regression/fsx, has been added, by David Rhodus.

fdisk now has a -p option, to let it operate on disk images.

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NFS fixes


David Rhodus has fixed the problems reported by Richard Sharpe where Linux NFS clients couldn’t achieve above 5 MBps throughput.

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Installing from source


I wrote down the explicit steps I used to get a DragonFly machine running and up-to-date; I’m including them here for the benefit of others. This was working as of mid-September.

** Updated December 2003; silly typos.

** Update February 2004: This guide was written using FreeBSD 4.8 as a guide; it may break. There is a guide page on dragonflybsd.org that talks about upgrading from FreeBSD 4.9.
More…

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Matt Dillon interview log


The Slashdot interview with Matt Dillon from last night is up, in text and HTML format.

For the heck of it, there’s a pre-DragonFly interview here on KernelTrap, too.

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Remaining Checkpoint work


Kip Macy listed a number of tasks left for his checkpoint/restart work, not all of which he will be covering. If this sounds interesting to you, jump in!
More…

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How to do a diff


In part of a conversation about checkpoint work, Matt Dillon described the preferred process for code changes. I’m pasting it in, wholesale.
More…

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More checkpoint work


Kip Macy’s very spiffy checkpoint work, allowing freezing/thawing of running applications, has resulted in a kernel module. It’s not yet in, but the most recent version he mentioned is available.

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Other port systems


Paul Jarc brought up “>Slashpackage as a possible solution to the ports system on DragonFly; Mike Porter pointed out that it covers most everything except shared library handling.

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NVIDIA driver work


Emiel Kollof is working on the NVIDIA binary video driver; so far it loads correctly, but doesn’t work in X11.

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FFS/softupdates history


In other discussion about a microkernel, Gary Thorpe noted these historical links about softupdates:

http://www.netbsd.org/Documentation/tune/5.html#a3
http://www.netbsd.org/Documentation/misc/#softdeps
http://www.mckusick.com/softdep/index.html
http://www.usenix.org/publications/library/proceedings/usenix99/mckusick.html

And Pedro Guffuni followed up with this:

http://www.ece.cmu.edu/~ganger/smallfiles.html

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Firewall Fun


Joshua Coombs noted he would like to work on a new firewall strategy for DragonFly, and pasted in some of his notes. They are complex enough that it’s better to paste than to sum up. (I sure could use the multiple routes he talks about.)

Pasted material follows:
More…

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Bugs, lost and found


It looks like the PC Card problems mentioned earlier are really a problem with the DHCP client. David Rhodus is looking for someone to try a new import of the ISC DHCP code. (Updated – an import from FreeBSD-5 is happening instead, since that fixes some problems with the most recent ISC code.)

Galen Sampson found that using NFS without -maproot will cause file truncation; Matt Dillon has a temporary hack that will fix it, which will be committed by the end of the week if it works without trouble.

Matt Dillon disabled background bitmap writes, as it can apparently cause certain race conditions. He notes: “Eventually the problem background bitmap writes solved will be solved more generally by implementing page COWing durign [sic] device I/O to avoid stalls on pages undergoing write I/O.”

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Matt Dillon IRC Interview


There’s a Slashdot article noting that Matt Dillon will be available for a Q&A session. It’s on Thursday, Oct. 9th, 9 PM EDT in SlashNET’s #forum. If you miss it, it should be later available in http://www.slashnet.org/forums/.

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PCMCIA Problems


Emiel Kollof found that to get a PCMCIA network card going, you need to add these lines to /etc/rc.conf: (replace x’s with your static address, if applicable.)


removable_interfaces="<interface name>"
pccard_ifconfig="inet xxx.xxx.xxx.xxx netmask xxx.xxx.xxx.xxx"
or
pccard_ifconfig="DHCP"

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Varsyms in FreeBSD


John De Boskey posted he had variant symlinks working under FreeBSD 4-Stable, and notes these patches:

http://people.freebsd.org/~jwd/mlinks/freebsd-magic-patches
http://people.freebsd.org/~jwd/mlinks/env-magic-patches

And this post to freebsd-stable.

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Microkernel link


During a separate thread about microkernels (short summary: it ain’t happening), Pedro Guffuni pointed out Exokernel, a OS project where most everything was in libraries.

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Debugging default


Debugging is now turned on by default in the GENERIC config.

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Bootsplash


Emiel Kollof made a bootsplash screen at 800x600x8, available here. Download, ungzip to /boot, and put these lines in your loader.conf:


vesa_load="YES"
splash_bmp_load="YES"
bitmap_load="YES"
bitmap_name="dfly.bmp"

The screen, incidentally, looks just like the main site logo.

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Last Syscall Separation Step


David P. Reese said his ‘step 5a’ patch is set for syscall separation. He stated this is his last step before starting the stackgap allocation send-off. Super!

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Variant Symlink explanations


Mike Porter wrote an extended entry about how variant symlinks could handle multiple versions of ports being installed, including a number of special cases like Perl and the modules installed for it.
More…

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More on layouts


César Duque posted his own take on how the DragonFly page should look:
http://www.notfound.org/df (it’s a large jpeg.)

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Promise Supertrack in


The Promise Supertrack controller (pst) is now in src/sys/i386/conf/LINT.

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A New Look


Hiten Pandya has apparently been working on a new version of the main site. Those changes are not (yet?) in CVS.

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Web events


This log has been linked on the Downloads page of the DragonFly BSD site.

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