Josh Berkus wrote: > Domas (of Facebook/Wikipedia, MySQL geek) pointed me to this report: > > http://www.phoronix.com/scan.php?page=article&item=linux_perf_regressions&num=1 > http://www.phoronix.com/scan.php?page=article&item=ext4_then_now&num=6 > The main change here was discussed back in January: http://archives.postgresql.org/message-id/4B512D0D.4030909@2ndquadrant.com What I've been doing about this is the writing leading up to http://wiki.postgresql.org/wiki/Reliable_Writes so that when RHEL6 does ship, we have a place to point people toward that makes it better documented that the main difference here is a reliability improvement rather than a performance regression. I'm not sure what else we can do here, other than organizing more testing for kernel bugs in this area on RHEL6. The only way to regain the majority of the "lost" performance here is to turn off synchronous_commit in the default config. -- Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD PostgreSQL Training, Services and Support www.2ndQuadrant.us "PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books
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