linux-kernel - Re: cups slow on linux-2.6.24

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Date:	Mon, 28 Jan 2008 23:56:29 +0100 (CET)
From:	Krzysztof Oledzki <ole@....pl>
To:	Jeff Chua <jeff.chua.linux@...il.com>
cc:	lkml <linux-kernel@...r.kernel.org>,
	cups-bugs <cups-bugs@...ysw.com>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	cups-bugs <cups-bugs@...ysw.com>, netfilter-devel@...r.kernel.org
Subject: Re: cups slow on linux-2.6.24



On Tue, 29 Jan 2008, Jeff Chua wrote:

>
>
> On Jan 28, 2008 7:18 AM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
>> I'm sending printing jobs to a network printer (it's actually printing
>> to the localhost simply creating a file), and running this on
>> Linux-2.6.24 will cause the printing to slow down to 1 print every 3
>> seconds after printing 500 times.
>
> I bisected the kernel since the last known good 2.6.23 and zeroed in to this 
> commit.
>
> commit 17311393f969090ab060540bd9dbe7dc885a76d5
> Author: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
> Date:   Thu Oct 11 14:35:52 2007 -0700
>
>    [NETFILTER]: nf_conntrack_tcp: fix connection reopening
>
>
> Reverting this commit solves the problem.
>
> Version              1000 jobs
> 2.6.23                 90 sec
> 2.6.24              1,492 sec  <== with commit
> 2.6.24(patch)          90 sec  <== reverted the commit
>

Strange. You stated that 2.6.23.12 is OK, however above patch
was included in 2.6.23.4:

http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.4
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.23.y.git;a=commitdiff;h=0ac38060c5e1e12e851ed3e281597286b57f9ad1

Commit 0ac38060c5e1e12e851ed3e281597286b57f9ad1 combines two fixes from 
2.6.24:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=17311393f969090ab060540bd9dbe7dc885a76d5
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=bc34b841556aad437baf4199744e55500bfa2088

Are you 100% sure that 2.6.23.12 is OK?

Best regards,

 				Krzysztof Olędzki