Messages in this thread | | | Date | Sat, 4 Feb 2006 23:24:29 +0100 | From | Willy Tarreau <> | Subject | Re: [ANNOUNCE] Linux Kernel Useful Patches (2.4) |
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Hi Barry,
On Sat, Feb 04, 2006 at 12:54:15PM -0800, Barry K. Nathan wrote: > On 2/4/06, Willy TARREAU <willy@w.ods.org> wrote: > > The last O(1) patch I've seen does not apply to kernels more recent than 2.4.19 > > (it's on Ingo's site). Do you have any up to date pointer that I could use ? > > However, I have a local rediff of the lowlat patch that I will include. > > (This e-mail ended up being a bit longer than I intended. The most > relevant stuff may be in the last couple of paragraphs, but I've > included the whole message for the sake of completeness.) > > Red Hat ships it in a 2.4.21-based kernel. Here's their latest source RPM: > ftp://ftp.redhat.com/pub/redhat/linux/updates/enterprise/3AS/en/os/SRPMS/kernel-2.4.21-37.0.1.EL.src.rpm > > However, I just remembered that the RHEL 3 kernel patch series starts > with an -ac patch and builds up from there. I think it gets the O(1) > scheduler from there but it might apply further patches to it (but I'm > not 100% sure my memory is correct here). > > Here's the last -ac patch: > http://kernel.org/pub/linux/kernel/people/alan/linux-2.4/2.4.22/patch-2.4.22-ac4.bz2
That's what I found too, but -ac is too much different. I tried applying some patches designed for 2.4.21-ac and 2.4.22-ac on their non-ac respective equivalents, and they rejected a lot of stuff.
> If you want to see what Red Hat/Fedora did against 2.4.22, this is > what the final Fedora Core 1 kernel shipped: > http://cvs.fedora.redhat.com/viewcvs/rpms/kernel/FC-1/ > (There are newer kernels for FC1 from Fedora Legacy, but I think those > just add security fixes.) > > There's also 2.4.27-pre2-pac1, which has the O(1) scheduler. I don't > know if it introduces any bugs into the O(1) scheduler though. (It did > introduce a bug into the overcommit accounting, because part of it was > missing.) > http://kernel.org/pub/linux/kernel/people/bero/2.4/2.4.27/patch-2.4.27-pre2-pac1.bz2 > > Finally, 2.4.31-lck1 has the O(1) scheduler. This is the "base" patch > for 2.4.31-lck1, which has O(1) but also has "kernel preemption, low > latency and CK interactivity": > http://www.plumlocosoft.com/kernel/patches/2.4/2.4.31/2.4.31-lck1/components/010-lckbase.diff.bz2 > > It's probably the most recent forward-port of the O(1) patch, and it's > probably going to be the smallest diff to look through as well, if you > want to cherry-pick it out and make it work on 2.4.32 or 2.4.33-pre.
I have not time to spend digging through the diff, but I can link to it. It clearly is the most recent version amongst all those we have seen.
> (I don't think I'll be doing this, however. The boxes I manage that > would greatly benefit from O(1) will probably move to kernel 2.6 soon > for other reasons anyway.) > -- > -Barry K. Nathan <barryn@pobox.com>
Thanks for your investigation, Willy
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