Re: [E1000-devel] problematic behaviour of e1000e

[Ronciak, J. <joh...@in...>]

> -----Original Message-----
> From: Allan, Bruce W [mailto:bru...@in...]
> Sent: Tuesday, December 20, 2011 8:43 AM
> To: b....@rh...; e10...@li...
> Subject: Re: [E1000-devel] problematic behaviour of e1000e
> 
> >-----Original Message-----
> >From: Barry Green [mailto:B....@rh...]
> >Sent: Tuesday, December 20, 2011 4:14 AM
> >To: e10...@li...
> >Subject: [E1000-devel] problematic behaviour of e1000e
> >
> >Hello, we use the e1000e linux driver on a supermicro motherboard with
> >IPMI. It is necessary for us to use the CrcStripping=0 option to use
> >IPMI when the network interface is configured to permit IPMI access.
> If
> >we add an additional interface which uses the same driver IPMI access
> >disappears even when CrcStripping is disabled. I have downloaded the
> >latest driver from the Intel site but it still has the problem (ver
> >1.6.3-NAPI) . I think I understand the problem. The CrcStripping
> >appears to only get disabled for the first device in the scan. When an
> >additional card is added this becomes the first card in the scan and
> >the interface with the IPMI BMC connected ceases to have CrcStripping
> >disabled and therefore stops responding to IPMI.
> >I hope I have correctly diagnosed this problem.
> >b.t.w we use SLC5 linux which is a rebuild of RHEL5 Barry Green
> 
> The CrcStripping module parameter is not a single setting for all the
> interfaces - it must be set for each interface.  For example with two
> interfaces supported by the e1000e driver, to disable the stripping of
> the CRC on both interfaces you will need to specify CrcStripping=0,0
> (you can verify the results in the system log).
> 
> HTH,
> Bruce.
In addition, the distribution you are using (SLC5) may renumber the interfaces if a new NIC is plugged into the system, especially since it sounds like your distribution is based on RHEL5.  Be careful of this when using the mechanism Bruce calls out above to make sure you are disabling the stripping on the correct interface.

Cheers,
John