From: Jens Axboe <axboe@kernel.dk>
To: Bruce Cran <bruce@cran.org.uk>
Cc: "Jeffrey McVay (jmcvay)" <jmcvay@micron.com>,
"fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: FIO 2.0.9 for Windows Server 2008 RC1 SP2 reports extreme latencies
Date: Wed, 10 Oct 2012 08:15:34 -0600 [thread overview]
Message-ID: <50758306.7020807@kernel.dk> (raw)
In-Reply-To: <507550DB.2000301@cran.org.uk>
On 2012-10-10 04:41, Bruce Cran wrote:
> On 10/10/2012 11:07, Bruce Cran wrote:
>> The problem is that windowsaio iterates over the list of outstanding
>> IOs (busylist), but that list has the most recent first.
>
> The attached patch appears to fix the problem:
>
> Add outstanding IOs to the tail of io_u_busylist, not the head.
So where is this bug exactly? Is Windows reaping events from the head of
this list, and thus starving indefinitely potentially?
Patch makes sense in any case, but it should not make a functional
difference. I'll apply it.
--
Jens Axboe
next prev parent reply other threads:[~2012-10-10 14:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-24 5:41 FIO 2.0.9 for Windows Server 2008 RC1 SP2 reports extreme latencies Jeffrey McVay (jmcvay)
2012-09-24 13:28 ` Bruce Cran
2012-09-26 16:30 ` Jeffrey McVay (jmcvay)
2012-09-26 16:32 ` Bruce Cran
2012-09-29 6:23 ` Jens Axboe
2012-09-29 13:46 ` Bruce Cran
2012-09-29 14:21 ` Jens Axboe
2012-10-06 0:25 ` Jeffrey McVay (jmcvay)
2012-10-10 10:07 ` Bruce Cran
2012-10-10 10:41 ` Bruce Cran
2012-10-10 14:15 ` Jens Axboe [this message]
2012-10-10 14:18 ` Bruce Cran
2012-10-10 14:19 ` Jens Axboe
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