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Re: svntest and tmpfs slow as disk

From: Blair Zajac <blair_at_orcaware.com>
Date: 2004-02-17 21:52:02 CET

Jani Averbach wrote:
> On 2004-01-30 16:22-0800, Blair Zajac wrote:
> > I'm now running svntest on a dual 3.06 Ghz system with 2 Gbytes of
> > RAM and using the ramdisk, but it's just as fast as running
> > the tests to disk. Has anybody else seen this.
> I have definetly seen that with 2.6.x kernels and
> __with ra_dav__. With 2.6.x kernels the tests almost stalled (dual
> amd64 system, 2G RAM), and take _a_lot_of_ time. With ordinary
> hd-based fs it will finish just fine. With 2.4.x kernels the tests are
> behaving normally with tmpfs vs. hd-based fs.
> > Only a load of 0.2.
> Same symptoms here, except that:
> > Running a timing test with a ext3 and tmpfs show the same time for a
> > full svntest (1 hour).
> In my system, ra_dav on tmpfs takes a much more longer than on ext3.
> > Very odd. Anybody has any ideas?
> >
> And one point more: ra_local and ra_svn work just fine with tmpfs, but
> ra_dav not -- but also ra_dav works ok with 2.4.x kernels. So I would
> point my finger to the 2.6.x kernels, and probably to the scheduler?

Odd that 2.6.x would behave differently there.

This system is running RedHat 9 with the latest kernel update from
RedHat, which is kernel-2.4.20-28.9.


Blair Zajac <blair@orcaware.com>
Plots of your system's performance - http://www.orcaware.com/orca/
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Received on Tue Feb 17 21:52:25 2004

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