Re: NFS client slow on amd64 6.2-PRERELEASE #2

Jeremy Chadwick wrote this message on Thu, Oct 05, 2006 at 09:08 -0700:
The problem in that case turned out to be duplex-related. Both
boxes were auto-negotiating with the Cisco switch correctly, and
indeed the Cisco labelled them as auto-100/full, but as anyone who
is familiar with Ciscos knows, auto-negotiation on Catalysts is
far from reliable. Both boxes reported auto-neg and being at 100/full
as well. I ended up hard-setting the boxes to use 100/full, and
set the switch ports to 100/full, then rebooted both boxes (yes,
this is sometimes required, as driver auto-neg code is a bit tweaky);
voila, problem fixed.

It appears that some ethernet drivers don't reset the phy (bring the
link down) when changing media (duplex setting, etc).. This means that
if you boot w/ autoselect, and the switch autoselects to 100/full, but
then later change it to 100/full (w/ autoselect off) it will work fine..
but then if the cabel is pulled, or the switch resets, it attempts to
reautoselect, but falls back to 100/half while you are still running
100/full...

As you can imagine, it causes a very hard to track down problem since
the time it breaks is not readily apparent...

an ifconfig <iface> down; ifconfig <iface> up may help resolve this
issue if you are not sure...

I have just committed a patch to fxp0 to do this...

--
John-Mark Gurney Voice: +1 415 225 5579

"All that I will do, has been done, All that I have, has not."
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Relevant Pages

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