linux-kernel - Re: [PATCH] ipc/msg: Implement lockless pipelined wakeups

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Date:	Tue, 3 Nov 2015 15:51:39 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Manfred Spraul <manfred@...orfullife.com>,
	linux-kernel@...r.kernel.org
Cc:	Davidlohr Bueso <dave@...olabs.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	George Spelvin <linux@...izon.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] ipc/msg: Implement lockless pipelined wakeups

On 11/01/2015 05:32 AM, Manfred Spraul wrote:
> Hi Sebastian,

Hi Manfred,

> with regards to functional tests:
> fakeroot is a heavy system V user (at least if it is configured for sysv).
> "make -j" under fakeroot was a useful stresstest

I don't see the msgsnd/msgrcv syscalls here. I do see others, sem
related for instance….

> with regards to benchmarks:
> I've attached one of my files.

Thank you. On 'AMD A10-7800 Radeon R7, 12 Compute Cores 4C+8G' I have
here:

test             |  before    |   after    | diff
-----------------|------------|-------------
pmsg-shared 8 60 | 52,386,363 | 56,455,763 | + ~7.77%
pmsg-shared 2 60 | 69,200,531 | 73,346,420 | + ~5.99%

so it improved a little :)

> Otherwise: Nice!
> 
> -- 
>     Manfred
> 

Sebastian
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