Hi, On Wed, 2003-12-17 at 15:06, M K wrote: > Still, I keep getting "hiccups" every few seconds while writing the > files.. mostly, these hiccups are at 5-second intervals, so it may > suggest that the ext3 default commit interval is the culprit, and the > effect has diminished after i changed the commit interval to 1 second > in the kernel code, under > linux/fs/jbd/journal.c, the line changed was: > journal->j_commit_interval = (HZ * 1); // originally HZ * 5. > I have some questions at this point: > 1. Is there any other way of modifying the commit interval? If > possible I would like to take the commit interval modification out of > the kernel and put it back in user level code.. Yes, you can mount with "-o commit=1" (or put "commit=1" in the options field in /etc/fstab) as long as you've got a moderately recent kernel. The 2.4.20-20.* Red Hat Linux kernels should include that. > 2. Are there other things that I should try to optimize the write > performance? There are various things you could try. In general, avoiding dependencies between different IOs is a good thing. That can mean splitting up files amongst more directories (htree will help to avoid the cost of large dirs, of course); or even splitting the storage into multiple different filesystems, or splitting the raid array into multiple arrays. Really, though, it's so application-dependent that it's hard to be any more specific than this. Cheers, Stephen _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
