Messages in this thread |  | | Subject | Re: 2.4.21-pre2 stalls out when running unixbench | From | "Stephen C. Tweedie" <> | Date | 06 Jan 2003 12:10:42 +0000 |
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Hi,
On Sat, 2003-01-04 at 11:11, Andrew Morton wrote:
> This is because of differences in how sync() is handled between 2.4.20's > ext3 and 2.4.21-pre2's. > > 2.4.21-pre2: > > sync() will start the commit, and will wait on it. So you know that > when it returns, everything which was dirty is now tight on disk. > > So yes, running a looping sync while someone else is writing stuff > will take much longer in 2.4.21-pre2, because that kernel actually > waits on the writeout.
Actually, I'm wondering if we should back that particular bit out. For a user with a hundred mounted filesystems, syncing each one in order, sequentially, is going to suck (and we don't currently have a simple way in 2.4 to detect which syncs are on separate spindles and so can be parallelised.)
--Stephen
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