linux-kernel - Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 05 Oct 2011 11:12:15 -0400
From:	starlight@...nacle.cx
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <cl@...two.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Willy Tarreau <w@....eu>, Ingo Molnar <mingo@...e.hu>
Subject: Re: big picture UDP/IP performance question re 2.6.18 
  -> 2.6.32

At 03:22 PM 10/5/2011 +0200, Peter Zijlstra wrote:
>On Tue, 2011-10-04 at 14:16 -0500, Christoph Lameter wrote:
>I suppose all this testing and feedback we receive
>from you really helps us keep the performance
>levels you want.. Oh wait, that's 0.

Well I have to admit that I've looked into the
future (i.e. tested kernel.org releases) only on
occasion.  To the extent that performance wasn't
looking great I harbored an apparently over
optimistic hope that things would get tuned/fixed
in the process somewhere.  In particular I was
thinking that RH might do something impressive
with RHEL 6 where Novell failed with SLES 11.
However, if anything the downstream is fiddling
less and less with the kernel as it becomes ever
more complex.

>Clearly none of the tests being ran on a regular
>basis, by for instance the Intel regression team,
>covers your needs. Start by fixing that.

I could create a test case.  It's quite a lot more
than trivial, but not ridiculous either.  That UDP
is broken on everything past 2.6.27 may goad me
into the effort.  Have had a fairly excellent
experience WRT the hugepage kernel corruption bugs
I reported 18 months or so ago.  Not only did the
kernel developers fix them, the fixes made it
downstream into RHEL fairly quickly.  So that does
encourage me.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/