On Wed, Feb 18, 2009 at 1:44 AM, Rajesh Kumar Mallah <mallah.rajesh@xxxxxxxxx> wrote: >>> Effect of ReadAhead Settings >>> disabled,256(default) , 512,1024 >>> > SEQUENTIAL >>> xfs_ra0 414741 , 66144 >>> xfs_ra256 403647, 545026 all tests on sda6 >>> xfs_ra512 411357, 564769 >>> xfs_ra1024 404392, 431168 >>> >>> looks like 512 was the best setting for this controller >> >> That's only known for sequential access. >> How did it perform under the random access, or did the numbers not >> change too much? > > RANDOM SEEKS /sec > > xfs_ra0 6341.0 > xfs_ra256 14642.7 > xfs_ra512 14415.6 > xfs_ra1024 14541.6 > > the value does not seems to be having much effect > unless its totally disabled. excellent. and yes, you have to dump and reload from 32 to 64 bit. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
