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From: Eric Wong <normalperson@yhbt.net>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: linux-kernel@vger.kernel.org,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Lai Jiangshan <laijs@cn.fujitsu.com>
Subject: Re: [RFC PATCH] wfcqueue: implement __wfcq_enqueue_head() (v3)
Date: Mon, 8 Apr 2013 02:17:50 +0000	[thread overview]
Message-ID: <20130408021750.GA7306@dcvr.yhbt.net> (raw)
In-Reply-To: <20130407151316.GB10154@Krystal>

Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> Changes since v2:
> * Only issue cmpxchg() if queue was empty.
> * Add missing memory barrier.

Thanks!

There's a slight drop in performance either from the barrier or larger
code, but I'm not worried (it was around 9-10s before wfcqueue).

$ time ./eponeshotmt -c 1000000 -w 4 -t 4 -f 10
real    0m 5.83s
user    0m 1.35s
sys     0m 21.95s

I also ran v2 on Davide Libenzi's totalmess epoll stresser for a few
hours yesterday without failures.  Running totalmess right now on v3,
so far so good :)

Tested-by: Eric Wong <normalperson@yhbt.net>

      reply	other threads:[~2013-04-08  2:17 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-07 15:13 Mathieu Desnoyers
2013-04-08  2:17 ` Eric Wong [this message]

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