On Fri, 2009-07-10 at 14:37 +0800, Wu Fengguang wrote: > On Tue, Jul 07, 2009 at 02:06:42PM +0800, Zhang, Yanmin wrote: > > On Tue, 2009-07-07 at 02:01 +0200, Rafael J. Wysocki wrote: > > > This message has been generated automatically as a part of a report > > > of recent regressions. > > > > > > The following bug entry is on the current list of known regressions > > > from 2.6.30. Please verify if it still should be listed and let me know > > > (either way). > > > > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13726 > > > Subject : fio sync read 4k block size 35% regression > > > Submitter : Zhang, Yanmin <yanmin_zhang@xxxxxxxxxxxxxxx> > > > Date : 2009-07-01 11:25 (6 days old) > > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=51daa88ebd8e0d437289f589af29d4b39379ea76 > > > References : http://lkml.org/lkml/2009/6/30/679 > > > Handled-By : Wu Fengguang <fengguang.wu@xxxxxxxxx> > > Fengguang, > > > > I'm still working on it now. The new testing against 2.6.31-rc2 is ongoing. > > fio sync/mmap read has new behavior. I did collect some data. But suddenly > > with new created data, the fio_sync_read_4k regression disappeared, while > > Do you mean the fio_sync_read_4k regression disappeared because we are > collecting data with lots of printks? No. I recreated the data and the regression disappeared. > > > fio_mmap_read is still there. Originally, the testing and bisect were stable. > > Let me check what happens firstly. > > Thanks! What's your fio_mmap_read job file and the readahead traces? I dumped trace data of fio and found the sync read isn't really sequential. I create many processes and every process could read a group of files. The trace shows fio reads a record of a file, then switch to another file to read. My original assumption is a process reads the complete file sequentially and then read the 2nd file. Now I upgrade fio the latest version and add parameter file_service_type=random:4000000 to rerun all testing. -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
