From: Jens Axboe <jaxboe@fusionio.com>
To: Steven Lang <tirea@google.com>
Cc: "fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: A commented out optimization...
Date: Thu, 2 Feb 2012 20:16:11 +0100 [thread overview]
Message-ID: <4F2AE0FB.3020201@fusionio.com> (raw)
In-Reply-To: <CAAUT-yO3JUwe_61XiKrxhQ2cD4NJOg+4k7ttxj_1D+wXY9P=gQ@mail.gmail.com>
On 2012-02-02 20:13, Steven Lang wrote:
> The only thing I can think is maybe there was some sort of other issue
> where perhaps a DMA IO was happening before the memory write,
> unrelated to any of the code there, but the write barrier just
> happened to fix it. But even that seems like it would be a bit of a
> stretch to imagine it actually being a problem.
I was thinking that could've been the issue as well, but in that case it
would be a kernel (or driver) bug in that it didn't flush.
--
Jens Axboe
prev parent reply other threads:[~2012-02-02 19:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 1:40 A commented out optimization Steven Lang
2012-02-01 8:22 ` Jens Axboe
2012-02-01 21:46 ` Steven Lang
2012-02-02 8:03 ` Jens Axboe
2012-02-02 19:13 ` Steven Lang
2012-02-02 19:16 ` Jens Axboe [this message]
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