Would 2.4.17 patched to 2.4.18-pre6 be better or worse than stock 2.4.17 ? a not-related question: what progress is being made on merging Daniel Phillip's "htree" into main Linux kernel ? Thanks for any and all information, -Mike Slifcak, working for Guardent, Inc. > -----Original Message----- > From: Stephen C. Tweedie [mailto:sct@redhat.com] > Sent: Monday, February 04, 2002 11:36 AM > To: Joe Radinger > Cc: ext3-users@redhat.com > Subject: Re: slowdown and reiserfs > > > Hi, > > On Mon, Feb 04, 2002 at 11:28:11AM +0100, Joe Radinger wrote: > > > i got 2 questions and maybe someone could shed some light: > > > > a) i'm using kernel 2.4.17 and use ext3 in it. is it > possible that the > > whole system is slower than with ext2? i switched back to > ext2 (great > > feature!!!) and the system's response seemed somewhat better. > > ext3 does often submit IO in bursts (because of the journal writes), > and that seems to have a big impact if the VM is not working well. > 2.4.17 has about the worst VM available for current kernels. Could > you try again, either with Rik's rmap patches, or Andrea's current aa > diffs? Both of those fix the many incompletenesses of the main 2.4.17 > VM. > > > should/could there be such a effect as double writing of > journaled data? > > No, but metadata will always be written twice in a physically > journaling filesystem such as ext3 or reiserfs. > > > b) is reiserfs compatible with ext3? > > You can use both at the same time, yes, but reiserfs has a different > on-disk format to ext3 so you have to chose one or the other for a > given filesystem. > > > is it possible use both journaling filesystems at the same time (of > > course on different partitions :)) > > Yes. > > Cheers, > Stephen > > > >
