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Re: sungem - ifconfig eth0 mtu 1300 -> oops

To: Jeff Garzik <jgarzik@xxxxxxxxx>
Subject: Re: sungem - ifconfig eth0 mtu 1300 -> oops
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 22 Jun 2004 11:03:34 -0500
Cc: Chris Friesen <cfriesen@xxxxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, kernel@xxxxxx, Linux Kernel list <linux-kernel@xxxxxxxxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <40D84A9B.8010503@xxxxxxxxx>
References: <20040621141144.119be627.davem@xxxxxxxxxx> <40D847E3.2080109@xxxxxxxxxxxxxxxxxx> <40D84A9B.8010503@xxxxxxxxx>
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On Tue, 2004-06-22 at 10:04, Jeff Garzik wrote:
> Chris Friesen wrote:
> > Just a quick question.  Does the sungem chip support jumbo frames?  I'd 
> > like to use MTU of 9000 to make large local transfers more efficient, 
> > but it didn't seem to work last time I checked.
> 
> 
> Are you 100% certain you configured the other side to support jumbo?
> 
> Jumbo frames are non-standard, and sometimes require configuring MTU on 
> the switch or remote network card (if directly connected).

Well, it's not enabled in the driver I think, or at least it wasn't last
time I looked. Dave told me the chip fifo's are too small to do anything
useful with jumbo frames.

Ben.



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