From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <544EC7F1.6010900@kernel.dk> Date: Mon, 27 Oct 2014 16:32:17 -0600 From: Jens Axboe MIME-Version: 1.0 Subject: Re: fio rbd completions (Was: fio rbd hang for block sizes > 1M) References: <5449BBB3.7090109@catalyst.net.nz> <5449E50E.7000808@kernel.dk> <5449EEF1.1060407@catalyst.net.nz> <544A51C7.40803@gmail.com> <544A5DA6.2010709@gmail.com> <544AD67D.4030603@catalyst.net.nz> <544AEAE7.6080603@redhat.com> <544AF0D2.1050405@catalyst.net.nz> <544B0C7F.4080109@catalyst.net.nz> <544B1D50.4010101@kernel.dk> <544B2C19.7070009@catalyst.net.nz> <544BF808.2090800@kernel.dk> <544C2371.1020403@catalyst.net.nz> <544E547C.30009@kernel.dk> <544E6330.1000202@kernel.dk> <544E63EA.1010204@kernel.dk> <544E6691.106@kernel.dk> <544E6A8D.1040608@kernel.dk> <544EC05D.7040807@catalyst.net.nz> In-Reply-To: <544EC05D.7040807@catalyst.net.nz> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit To: Mark Kirkwood , Ketor D Cc: Mark Nelson , Mark Nelson , fio@vger.kernel.org, "xan.peng" , "ceph-devel@vger.kernel.org" List-ID: On 10/27/2014 03:59 PM, Mark Kirkwood wrote: > On 28/10/14 05:20, Ketor D wrote: >> V8 patch runs good. >> >> The iops is 33032. If I just comment the usleep(100) in the master, I >> can get iops 35245. >> The CPU usage about the two test is same 120%. >> So maybe this patch could be better! >> > > Yeah, v8 is working for me. > > I'm seeing it a bit slower for some blocksizes, but faster (or perhaps > about the same within repeat measurement error) for others: > > blocksize k | patched iops | orig iops > ------------+---------------+----------- > 4 | 12265 | 11930 > 128 | 5800 | 7100 > 1024 | 1193 | 1196 As for most things, the difference should be in IOPS, not bandwidth. So I would assume that the above are within normal variance, since 4k should show the biggest difference, then drop off after that and match at 128/1024k. -- Jens Axboe