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Date: Thu, 19 Apr 2007 11:03:47 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Valerie Clement <valerie.clement@...l.net> Cc: ext4 development <linux-ext4@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7 On Wed, Apr 18 2007, Valerie Clement wrote: > > Running benchmark tests (FFSB) on an ext4 filesystem, I noticed a > performance degradation (about 15-20 percent) in sequential write tests > between 2.6.19-rc6 and 2.6.21-rc4 kernels. > > I ran the same tests on ext3 and XFS filesystems and I saw the same > performance difference between the two kernel versions for these two > filesystems. > > I have also reproduced it between 2.6.20.7 and 2.6.21-rc7. > The FFSB tests run 16 threads, each creating 1GB files. The tests were > done on the same x86_64 system, with the same kernel configuration and > on the same scsi device. Below are the throughput values given by FFSB. > > kernel XFS ext3 > ---------- > 2.6.20.7 48 MB/sec 44 MB/sec > > 2.6.21-rc7 38 MB/sec 37 MB/sec > > Did anyone else run across the problem? > Is there a known issue? Please tell me how you are running ffsb, and also please include a dmessg from a booted system. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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