On Mon, Dec 17, 2007 at 11:27:42PM +0100, Roman Zippel wrote:
> > I've upgraded the following machines lately to kernel 2.6.23-m68k and
> > etch-m68k:
> You might want to test 2.6.22 as well. The new scheduler hasn't exactly
> been an improvement for us, here are some lmbench numbers:
> Context switching - times in microseconds - smaller is better
> -------------------------------------------------------------------------
> Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
> ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
> --------- ------------- ------ ------ ------ ------ ------ ------- -------
> sodom Linux 2.6.22- 52.4 125.9 123.5 158.8 153.6 174.8 153.6
> sodom Linux 2.6.22- 49.9 142.4 126.5 158.5 156.8 176.6 152.9
> sodom Linux 2.6.23- 112.0 176.6 159.8 256.9 216.4 268.8 242.1
> sodom Linux 2.6.23- 112.4 177.5 164.8 259.5 232.5 263.9 240.9
> sodom Linux 2.6.23- 133.3 206.6 189.8 280.1 269.8 297.9 267.6
Oooops... that's not really an improvement... anyway, I've chosen 2.6.23 as
it was the latest and the easiest to checkout from the m68k cvs for me. And
it contained the SCSI patches for WarpEngine and A4000T SCSI....
I assume that the above values are valid for the default scheduler, but how
about other schedulers?
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_DEFAULT_IOSCHED="cfq"
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