On 11/9/2010 4:31 PM, Simon Matter wrote:
On Mon, Nov 08, 2010 at 09:58:12PM -0500, Ashley Penney wrote:
One thing to consider is the 'nobarrier' option for ext4 - apparently
makes
a big performance difference.
This is probably it. This was discussed ad infinitum when it was
changed upstream, and caused a huge performance regression across
pretty much every workload.
But don't barriers affect mostly writes? If yes, is it because of the logs
and atime? 80% still looks like too much, maybe it's so bad because of the
virtualized environment?
Simon
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no because both were run in the same virtualized environment.
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