From: Ben Greear <greearb@candelatech.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: "'netdev@oss.sgi.com'" <netdev@oss.sgi.com>
Subject: Re: 2.4.21: bug report for tg3: tx lockup when changing MTU
Date: Fri, 01 Aug 2003 17:24:00 -0700 [thread overview]
Message-ID: <3F2B04A0.9030101@candelatech.com> (raw)
In-Reply-To: <3F2AFE7A.10203@pobox.com>
Jeff Garzik wrote:
> Ben Greear wrote:
>
>> I just noticed that if you change the MTU of a tg3 NIC, it will not work
>> untill you ifdown/ifup it. This problem is repeatable on tg3, and
>> does not
>> happen with the e1000 driver/cards.
>>
>> I am setting the MTU via an ioctl call, not via ifconfig or something
>> like
>> that.
>
>
>
> Can you provide the ioctl call info, so I can reproduce?
>
> And, are you changing MTU when the interface is up or down?
Interface is up and transmitting/receiving pkts at the time.
I just reproduced it with commands below. It is probably a race,
so not sure that either of these will always fail. Running about
10kpps rx+tx. Was sending pktgen (UDP) traffic of fixed length, so the actual
transmitted packet sizes remains the same in this case.
# MTU is at 1500
ifconfig eth5 mtu 4096 #worked
ifconfig eth5 mtu 4000 # failed.
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2003-08-02 0:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-01 22:54 2.4.21: bug report for tg3: tx lockup when changing MTU Ben Greear
2003-08-01 23:57 ` Jeff Garzik
2003-08-02 0:24 ` Ben Greear [this message]
2003-08-02 9:44 ` Sascha Schumann
2003-08-03 3:48 ` Ben Greear
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