linux-kernel - Re: [PATCH 2/2] tty: Use unbound workqueue for all input workers

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Date:	Sat, 17 Oct 2015 21:32:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] tty: Use unbound workqueue for all input workers

On Sat, Oct 17, 2015 at 04:36:24PM -0400, Peter Hurley wrote:
> The commonly accepted wisdom that scheduling work on the same cpu
> that handled interrupt i/o benefits from cache-locality is only
> true if the cpu is idle (since bound kworkers are often the highest
> vruntime and thus the lowest priority).
> 
> Measurements of scheduling via the unbound queue show lowered
> worst-case latency responses of up to 5x over bound workqueue, without
> increase in average latency or throughput.
> 
> pty i/o test measurements show >3x (!) reduced total running time; tests
> previously taking ~8s now complete in <2.5s.

Wow, nice job with this, that's unexpected.

greg k-h
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