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Re: svntest and tmpfs slow as disk

From: Jani Averbach <jaa_at_jaa.iki.fi>
Date: 2004-01-31 01:47:14 CET

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?

BR, Jani

Jani Averbach 
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Received on Sat Jan 31 01:47:28 2004

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