 | | | jumbo frames issue (9000 bytes MTU) | jumbo frames issue (9000 bytes MTU) 2005-07-28 - By Tom Sightler
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On Thu, 2005-07-28 at 08:01 -0500, Lee Whatley, Contractor wrote:
> wolf2k5 wrote:
> > Also, the NFS mounts didn't work anymore.
>
> We have some Sun nfs servers that use jumbo frames, and to get RHEL to
> nfs-mount those filesystems we had to change from using udp to tcp for
> nfs. I think we also bumped-up the rsize and wsize to something like 16384.
Yup, jumbo frame support in RHEL3 is totally broken when it comes to
UDP. I filed a bugzilla and support request over a year ago with
reproducible test cases using both NFS and simple tracepath commands,
including packet captures. I even went so far to figure out exactly
which specific patch you could back out to correct the problem (the core
ipsec patch in the RHEL3 tree).
The bugzilla never went anywhere. The support request got the official
response of "This isn't that important so we're not going to fix it."
This seems to work fine in RHEL 2.1 and 4 however.
Later,
Tom
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