----- 原始邮件 ----- > 发件人: "Dave Chinner" <david@xxxxxxxxxxxxx> > 收件人: "CAI Qian" <caiqian@xxxxxxxxxx> > 抄送: xfs@xxxxxxxxxxx, "Steve Best" <sbest@xxxxxxxxxx> > 发送时间: 星期四, 2013年 2 月 28日 下午 7:54:10 > 主题: Re: possible fsync02() xfs slowness regression on power7 > > On Thu, Feb 28, 2013 at 04:28:35AM -0500, CAI Qian wrote: > > This LTP test starting to fail using the latest upstream kernel on > > one of the power7 > > systems here, http://tinyurl.com/bngwouj > > > > # ./fsync02 > > fsync02 1 TFAIL : fsync took too long: 252.000000 seconds; > > max_block: 214 > > > > When it is working, the test is almost returned immediately. The > > bisecting so far > > indicated that one or a few of the following could be culprits. > > > > # git log --pretty=oneline > > 498f7f505dc79934c878c7667840c50c64f232fc..b199c8a4ba11879df87daad496ceee41fdc6aa82 > > They are all patches committed more than 2 years ago, and none of > them are platform specific. This sounds more like a machine specific > issue than a platform specific problem (i.e. lots of RAM, slow, > slow disk). > > In future when reporting a bug, please tell use hardware you are > using as per: > > http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F > > Given that this is a sparse file test that repeatedly extends the > file, this is the likely culprit: > > > 055388a3188f56676c21e92962fc366ac8b5cb72 xfs: dynamic speculative > > EOF preallocation Yes, you are right, just confirmed it. Nice catch! > > And this commit in 3.9-rc1: > > a1e16c2 xfs: limit speculative prealloc size on sparse files Just back-ported it and running at the moment and will let you know. Thanks Dave. > > should fix the problem. Please confirm these commits are the cause > and the fix respectively.... > > Cheers, > > Dave. > -- > Dave Chinner > david@xxxxxxxxxxxxx > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
