Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

From: Francois Romieu
Date: Tue Aug 25 2009 - 18:15:10 EST

Eric W. Biederman <ebiederm@xxxxxxxxxxxx> :
> I am a bit curious about TxDescUnavail. Perhaps we had a temporary
> memory shortage and that is what was screaming? I don't think we do
> anything at all with that state.

You are not alone, the driver completely ignores this bit.

As far as I remember, the TxDescUnavail event mostly pops up when the
driver makes an excessive use of TxPoll requests.

> Perhaps the flaw here is simply not masking TxDescUnavail while we are
> in NAPI mode ?

Yes, it is worth trying.

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