NFS async writes working in 2.4.7 but not 2.4.20

Hello,

I have a RH 7.2 workstation that is nfs mounting some directories. It works fine
under kernel 2.4.7. However, If I switch to kernel 2.4.20-xfs (the stock 2.4.20,
with Sun's XFS patch), then my NFS writes become very slow -- approx 10 seconds
to copy 1MB to the nfs file system. Reads are unaffected.

I'm assuming this has something to do with the nfs sync/async options. I've
tried putting the async option in /etc/fstab to no avail.

While I'm sure I can dig through the kernel myself and figure out what is going
wrong, I was hoping somebody just "knew" what the problem was....

Thanks,
Scott

Scott ((E-Mail Removed)) wrote:

> I have a RH 7.2 workstation that is nfs mounting some directories. It
> works fine under kernel 2.4.7. However, If I switch to kernel 2.4.20-xfs
> (the stock 2.4.20, with Sun's XFS patch), then my NFS writes become very
> slow -- approx 10 seconds to copy 1MB to the nfs file system. Reads are
> unaffected.
>
> I'm assuming this has something to do with the nfs sync/async options.
> I've tried putting the async option in /etc/fstab to no avail.
>
> While I'm sure I can dig through the kernel myself and figure out what is
> going wrong, I was hoping somebody just "knew" what the problem was....

FYI, keep in mind that you can set async/sync at both the server
(e.g. /etc/exports) *and* client side (e.g. /etc/fstab) of things.

-- Rex