I'm consulting on an issue where we are seeing an increase in network
traffic between 2.4.21 and 2.6.9 kernels with the use of the nocto
option. This is raising a performance concern.
I'm wondering what has changed with this option between the two kernel
levels.
Thanks
Frank Filz
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On Fri, 2006-07-07 at 10:37 -0700, Frank Filz wrote:
> I'm consulting on an issue where we are seeing an increase in network
> traffic between 2.4.21 and 2.6.9 kernels with the use of the nocto
> option. This is raising a performance concern.
>
> I'm wondering what has changed with this option between the two kernel
> levels.
Nothing much. What does nfsstat tell you has changed?
Cheers,
Trond
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On Fri, 2006-07-07 at 13:43 -0400, Trond Myklebust wrote:
> On Fri, 2006-07-07 at 10:37 -0700, Frank Filz wrote:
> > I'm consulting on an issue where we are seeing an increase in network
> > traffic between 2.4.21 and 2.6.9 kernels with the use of the nocto
> > option. This is raising a performance concern.
> >
> > I'm wondering what has changed with this option between the two kernel
> > levels.
>
> Nothing much. What does nfsstat tell you has changed?
I currently don't have access to the machines involved. I'm trying to
get a bit more information. Looking at the code, I do see that the check
for the nocto option has moved from nfs_open to nfs_lookup_verify_inode.
Frank
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On Fri, 2006-07-07 at 11:00 -0700, Frank Filz wrote:
> I currently don't have access to the machines involved. I'm trying to
> get a bit more information. Looking at the code, I do see that the check
> for the nocto option has moved from nfs_open to nfs_lookup_verify_inode.
Yes. That is because we have moved the close-to-open cache consistency
checking into nfs_lookup()/nfs_lookup_revalidate().
Cheers,
Trond
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