FILE_SYNC slower than UNSTABLE + COMMIT

[Venkatesh K S <vsharma@sonoasystems.com>]

Hi,

I have 2 different kernel versions and I notice that the way
the nfs client honors O_SYNC is different.
In 2.6.12 variant the client issues UNSTABLE followed by
a COMMIT call.
In 2.6.16 variant the nfs client issues a FILE_SYNC call.

The FILE_SYNC call turns out to be about 3 times slower
against our server. Infact a simple write followed by a
fsync also turns out to be FILE_SYNC calls. The mount
is not a "sync" mount.


Is there a way a to make these calls in 2.6.16 or later release
UNSTABLE + COMMIT ?

Are FILE_SYNC calls always slower (I wud assume for NVRAM based server
it may be as fast as UNSTABLE). In which case this fix into a newer
kernel seems to be biased towards working well with such servers

regards,
-venkatesh


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