Jumbo frames from 1750 to NetApp filer

Michael A. Morianos morianos at lastminutetravel.com
Tue May 18 10:33:14 CDT 2004

Not sure if this would help but perhaps the bcm5700 driver/module would 
work better?

Just a thought,


David Bloomfield wrote:

> Hi all,
> I'm trying to get jumbo frames working between a PE1750 running RHEL ES
> 3 (patched up to date) and a NetApp FAS940 filer.
> The server has an Intel PRO/1000 MT dual port card as well as the two
> embedded Broadcom ports. 
> Both server and filer are connected to an Extreme Summit 7i switch,
> connecting at 1000 Mb/s, full duplex.
> With everything configured for an MTU of 9000, NFS access from the
> server to the filer completely hangs as soon as more than a trivial
> amount of traffic is transferred. Once this happens, all further NFS
> requests block, even using things like "df".
> If the MTU somewhere along the chain is dropped back to 1500, NFS access
> returns, including anything left hanging from before.
> I'm aware of a possible issue with the Intel card and MTU values greater
> than 8998, but I've tried using a lower value, and anyway, this problem
> also occurs when using the Broadcom ports. 
> The driver modules (e1000 and tg3) are those supplied in the kernel
> (currently 2.4.21-15.ELsmp), and the NFS mount options are:
> rw,proto=tcp,hard,bg,intr,wsize=32768,rsize=32768
> Any thoughts welcome.
> Regards,
> David
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