From: Shaun Ruffell <sruffell@digium.com>
To: Venkatesh Pallipadi <venki@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-kernel@vger.kernel.org, Paul Turner <pjt@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Yong Zhang <yong.zhang0@gmail.com>
Subject: Re: [PATCH 0/5] Proper kernel irq time reporting -v0
Date: Thu, 21 Oct 2010 12:25:24 -0500 [thread overview]
Message-ID: <4CC07784.4090805@digium.com> (raw)
In-Reply-To: <1287614941-32325-1-git-send-email-venki@google.com>
On 10/20/2010 05:48 PM, Venkatesh Pallipadi wrote:
> This is part 2 of
> "Proper kernel irq time accounting -v4"
> http://lkml.indiana.edu/hypermail//linux/kernel/1010.0/01175.html
>
> and applies over those changes.
>
I applied both sets on top of 2.6.36 and tested on x86 32-bit and 64-bit
machines with some telephony cards that interrupt at a 1000Hz rate. The
time reported in top matched the expected value as measured with the
function graph tracer. i.e, if /sys/kernel/debug/tracing/trace
indicated that the interrupt handler was averaging 13us, then top was
reporting 1.3% CPU time. I changed the smp_affinity and the "hi" time
moved around as I would have expected. I also scheduled work items on
all the CPUs that just disable interrupt and spin for a selectable
period. Scheduling 100ms of non-interruptible delay at 1 second
intervals resulted in 10% time in "hi" as expected.
Hopefully I can check it out on a Powermac G3 B&W next week sometime,
but FWIW:
Tested-by: Shaun Ruffell <sruffell@digium.com>
prev parent reply other threads:[~2010-10-21 17:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 22:48 [PATCH 0/5] Proper kernel irq time reporting -v0 Venkatesh Pallipadi
2010-10-20 22:48 ` [PATCH 1/6] Free up pf flag PF_KSOFTIRQD Venkatesh Pallipadi
2010-10-21 5:23 ` Eric Dumazet
2010-10-21 14:36 ` Venkatesh Pallipadi
2010-10-21 14:58 ` Eric Dumazet
2010-10-21 17:03 ` Venkatesh Pallipadi
2010-10-21 15:13 ` Christoph Lameter
2010-10-21 17:06 ` Venkatesh Pallipadi
2010-10-20 22:48 ` [PATCH 2/6] Add nsecs_to_cputime64 interface for asm-generic Venkatesh Pallipadi
2010-10-20 22:48 ` [PATCH 3/6] Refactor account_system_time separating id and actual update Venkatesh Pallipadi
2010-10-20 22:49 ` [PATCH 4/6] Export ns irqtimes from IRQ_TIME_ACCOUNTING through /proc/stat Venkatesh Pallipadi
2010-10-21 14:44 ` Peter Zijlstra
2010-10-21 19:25 ` Venkatesh Pallipadi
2010-10-22 12:23 ` Peter Zijlstra
2010-10-22 23:34 ` Venkatesh Pallipadi
2010-10-20 22:49 ` [PATCH 5/6] Account ksoftirq time as cpustat softirq Venkatesh Pallipadi
2010-10-21 14:53 ` Peter Zijlstra
2010-10-21 19:10 ` Venkatesh Pallipadi
2010-10-21 17:25 ` Shaun Ruffell [this message]
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