netdev - Re: [PATCH] Regression: e100_phy_init() isolates even selected PHY, causes 10 seconds boot delay

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Message-ID: <9929d2390910290619j65be89f0nd8e00fa460b1723f@mail.gmail.com>
Date:	Thu, 29 Oct 2009 06:19:25 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	David Miller <davem@...emloft.net>
Cc:	bernhard.kaindl@....net, bruce.w.allan@...el.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Regression: e100_phy_init() isolates even selected PHY, 
	causes 10 seconds boot delay

On Thu, Oct 29, 2009 at 06:02, David Miller <davem@...emloft.net> wrote:
> From: Bernhard Kaindl <bernhard.kaindl@....net>
> Date: Wed, 30 Sep 2009 22:33:31 +0200
>
>> The current e100.c:e100_phy_init() electrically isolates all
>> the PHYs (even the selected PHY -- for a short time!) from the MII.
>>
>> This happens only for a short duration before the isolation
>> of the selected PHY is reverted, but it's enough to cause a
>> major disturbance in the startup of our e100-based cards:
>>
>> On a number of Embedded/Industry Pentium boards which are in use,
>> the result is that the initial DHCP negotiation takes more
>> than 10 seconds to complete with 2.6.30 and .31, while it's
>> done in a fraction of a second with 2.6.29 and earlier
>> (kernels tested with no delay range from 2.6.23 to 2.6.29)
>>
>> That regression was introduced on March 31 in the by a patch
>> from Bruce which first appeared in 2.6.30-rc3:
>
> Bruce, can you give some feedback on this?  I'd like to see this issue
> move forward.
>
> The only reason I haven't applied Bernhard's patch is because I
> haven't seen any feedback from Intel.  But I will apply it anyways if
> I don't see reasonable feedback soon.
>
> Thanks.

Bruce has been working on this and we currently have a patch in test.
We should have an updated patch submitted later today or tomorrow.

-- 
Cheers,
Jeff
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