Messages in this thread | | | Date | Thu, 19 Sep 2002 22:44:36 +0100 | From | "Stephen C. Tweedie" <> | Subject | Re: [Ext2-devel] Re: fsync 50 times slower after 2.5.27 |
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Hi,
On Thu, Sep 19, 2002 at 02:22:30PM -0700, Andrew Morton wrote:
> Thanks for testing. The semantics of sched_yield() have changed > significantly in 2.5. Probably correctly, but it is breaking a > few things which were tuned for the old semantics. Amongst those > things are OpenOffice and, it seems, ext3 transaction batching. > > The transaction batching does good things under some situations, > and we want it to keep working. I'll sit tight for the while, see > where shed_yield() behaviour ends up. If we still have a problem > then probably a schedule_timeout(1) in there would suffice.
Actually, with a proper yield() implementation, we can achieve the same effect by making the commit thread do the yield itself before locking down the transaction. Having _every_ sync thread do a yield itself before calling for a commit is probably overkill.
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