Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair()
From: Michael Wang
Date: Fri Feb 22 2013 - 01:06:51 EST
On 02/22/2013 01:08 PM, Mike Galbraith wrote:
> On Fri, 2013-02-22 at 10:37 +0800, Michael Wang wrote:
>> According to the testing result, I could not agree this purpose of
>> wake_affine() benefit us, but I'm sure that wake_affine() is a terrible
>> performance killer when system is busy.
> (hm, result is singular.. pgbench in 1:N mode only?)
I'm not sure about how pgbench implemented, all I know is it will create
several instance and access the database, I suppose no different from
several threads access database (1 server and N clients?).
There are improvement since when system busy, wake_affine() will be skipped.
And in old world, when system is busy, wake_affine() will only be
skipped if prev_cpu and curr_cpu belong to different nodes.
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/