From: Lee Revell <rlrevell@joe-job.com>
To: Dimitri Sivanich <sivanich@sgi.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org,
Thomas Gleixner <tglx@linutronix.de>, Andi Kleen <ak@suse.de>,
Jes Sorensen <jes@sgi.com>, Eric Dumazet <dada1@cosmosbay.com>
Subject: Re: [PATCH] Migration of Standard Timers
Date: Tue, 19 Sep 2006 12:57:53 -0400 [thread overview]
Message-ID: <1158685073.11682.25.camel@mindpipe> (raw)
In-Reply-To: <20060919164159.GC26863@sgi.com>
On Tue, 2006-09-19 at 11:41 -0500, Dimitri Sivanich wrote:
> On Tue, Sep 19, 2006 at 12:33:37PM -0400, Lee Revell wrote:
> > Which driver or subsystem is doing 100s of usecs of work in a timer?
>
> The longest one I've captured so far results from:
>
> rsp rip Function (args)
> ======================= <nmi>
> 0xffff810257822fd8 0xffffffff803a0e94 rt_check_expire+0x8c
> ======================= <interrupt>
> 0xffff81025781fee8 0xffffffff803a0e08 rt_check_expire
> 0xffff81025781ff08 0xffffffff802386b3 run_timer_softirq+0x133
> 0xffff81025781ff38 0xffffffff80235262 __do_softirq+0x5e
> 0xffff81025781ff68 0xffffffff8020a958 call_softirq+0x1c
> 0xffff81025781ff80 0xffffffff8020bea7 do_softirq+0x2c
> 0xffff81025781ff90 0xffffffff80235142 irq_exit+0x48
>
Ah, I remember that one. Eric Dumazet had some suggestions to fix it
6-12 months ago which never went anywhere - the thread was called "RCU
latency regression in 2.6.16-rc1".
That one is especially annoying as there's no workaround (shrinking the
route cache or reducing the GC interval via net.ipv4.route.* sysctls has
no effect)
Lee
next prev parent reply other threads:[~2006-09-19 16:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-19 15:29 [PATCH] Migration of Standard Timers Dimitri Sivanich
2006-09-19 16:33 ` Lee Revell
2006-09-19 16:41 ` Dimitri Sivanich
2006-09-19 16:57 ` Lee Revell [this message]
2006-09-22 19:16 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2006-09-14 13:29 [PATCH] Migration of standard timers Dimitri Sivanich
2006-09-14 14:11 ` Jes Sorensen
2006-09-14 14:30 ` Dimitri Sivanich
2006-09-15 6:06 ` Andrew Morton
2006-09-15 16:39 ` Thomas Gleixner
2006-09-15 16:58 ` Dimitri Sivanich
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