netdev - Re: [net 1/2] e1000e: MSI interrupt test failed, using legacy interrupt

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Date:	Wed, 25 Apr 2012 15:46:00 -0700
From:	Prasanna Panchamukhi <ppanchamukhi@...erbed.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com
Subject: Re: [net 1/2] e1000e: MSI interrupt test failed, using legacy interrupt

On 04/25/2012 08:59 AM, Ben Hutchings wrote:
> On Tue, 2012-04-24 at 22:55 -0700, Jeff Kirsher wrote:
>> From: Prasanna S Panchamukhi<ppanchamukhi@...erbed.com>
>>
>> Following logs where seen on Systems with multiple NICs,
>> while using MSI interrupts as shown below:
> [...]
>> This patch fixes this problem by increasing the msleep from 50 to 100.
> [...]
>
> It probably doesn't, in general.  The out-of-tree version of the sfc
> driver used to perform an interrupt test during probe, and after fixing
> it up repeatedly I eventually had to remove it completely as there are
> so many ways to get a false negative.  Also see the related commit
> 93e5dfa59b0e26a145a8adce5c9edf50bdaef4c7 ('sfc: Raise self-test
> timeouts').
>
Thanks Ben for your review.
In general Ben's approach looks good fix to avoid false negatives. To 
give a little
bit of background, this issues is seen mostly with Intel 82571 Dual/quad 
port Gigabit ethernet controller add-on NICs and not seen with other 
Intel ethernet controller NICs. If Ben suggested
approach is the best way to go, I will provide a patch  soon.

Thanks,
Prasanna

> Ben.
>

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