netdev - Re: multiqueue interrupts...

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Message-Id: <20080919.131254.44610374.davem@davemloft.net>
Date:	Fri, 19 Sep 2008 13:12:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	brice@...i.com
Cc:	bhutchings@...arflare.com, netdev@...r.kernel.org
Subject: Re: multiqueue interrupts...

From: Brice Goglin <brice@...i.com>
Date: Fri, 19 Sep 2008 14:29:07 +0200

> Ben Hutchings wrote:
> > On Thu, 2008-09-18 at 19:38 -0700, David Miller wrote:
> > [...]
> >   
> >> So on a multiqueue card with 2 RX queues and 2 TX queues we'd
> >> have names like:
> >>
> >> 	eth0-rx-0
> >> 	eth0-rx-1
> >> 	eth0-tx-0
> >> 	eth0-tx-1
> >>
> >> So let's make an effort to get this done right in 2.6.28 and meanwhile
> >> Arjan can add the irqbalanced code.
> >>     
> >
> > What about the case where an interrupt is shared between RX and TX
> > completions?  Our hardware is very flexible in this regard, but based on
> > performance testing prior to the introduction of TX multiqueue we
> > currently allocate multiple interrupts for RX completions and share the
> > first with TX completions.
> >   
> 
> myri10ge uses the same interrupts for TX and RX. The current name is
> eth%d:slice-%d but we could change it if there's a consensus.

You might be OK as-is.  If we make irqbalanced look for X-%d, you'll
likely be fine.
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