netdev - RE: [PATCH 2.6.25 1/1]S2io: Multiqueue network device support implementation

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Date:	Thu, 24 Jan 2008 22:19:45 -0500
From:	"Ramkrishna Vepa" <Ramkrishna.Vepa@...erion.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Sreenivasa Honnur" <Sreenivasa.Honnur@...erion.com>,
	<netdev@...r.kernel.org>, <jeff@...zik.org>,
	"support" <support@...erion.com>
Subject: RE: [PATCH 2.6.25 1/1]S2io: Multiqueue network device support implementation

> > [Ram] I am assuming that this is with regards to msi-x interrupts.
We
> 
> Yes.
> 
> And avoiding bouncing locks for device state between CPUs.
> 
> > have done away with handling tx completion in the interrupt handler,
and
> > are instead handling them in the context of the transmit. The slow
path,
> > straggling transmit completions will be handled in the timer
context.
> 
> Ok -- hopefully you don't have bad corner cases from this when the
pipe
> is not fully filled and then causing longer latencies on completion.
> Old NAPI sometimes suffered from such problems.
[Ram] We have hit the driver pretty hard during testing and have not
encountered any problems either on the network or host.

Ram
> 
> -Andi
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