netdev - Re: [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness

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Date:	Tue, 23 Mar 2010 14:45:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alexander.h.duyck@...el.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] net: add additional lock to qdisc to increase
 enqueue/dequeue fairness

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 23 Mar 2010 21:54:27 +0100

> Quite frankly, the real problem in this case is not the reduced
> throughput, but fact that one cpu can stay a long time doing the xmits
> to device, of skb queued by other cpus. This can hurt latencies a lot,
> for real time threads for example...
> 
> I wonder if ticket spinlocks are not the problem. Maybe we want a
> variant of spinlocks, so that cpu doing transmits can get the lock
> before other cpus...

I want to note that things operate the way they do now
intentionally.

Herbert Xu and Jamal Hadi Salim were active in this area
about 4 years ago.
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