netdev - Re: [PATCH net-next 2/2] bnx2x: use the default NAPI weight

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Message-ID: <20130310083800.GC10448@gondor.apana.org.au>
Date:	Sun, 10 Mar 2013 16:38:01 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	eilong@...adcom.com, jhs@...atatu.com,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH net-next 2/2] bnx2x: use the default NAPI weight

On Wed, Mar 06, 2013 at 01:52:57PM -0800, Eric Dumazet wrote:
>
> - BQL (incurring more TX completion rounds and possibility to
> block/unblock a qdisc)
> - ticket spinlocks, and even with the guard of qdisc busylock
> 
> -> we can have a starvation problem.

This only happens in cases where we aren't using multiqueue or
we're using it incorrectly, resulting in TX work from being split
over CPUs.

In that case it's not clear that it is starvation if we keep the
TX processing on one CPU.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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