From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: alexander.h.duyck@intel.com, netdev@vger.kernel.org
Subject: Re: [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness
Date: Tue, 23 Mar 2010 14:45:12 -0700 (PDT) [thread overview]
Message-ID: <20100323.144512.140757007.davem@davemloft.net> (raw)
In-Reply-To: <1269377667.2915.25.camel@edumazet-laptop>
From: Eric Dumazet <eric.dumazet@gmail.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.
next prev parent reply other threads:[~2010-03-23 21:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-23 20:25 [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness Alexander Duyck
2010-03-23 20:31 ` David Miller
2010-03-24 2:12 ` Andi Kleen
2010-03-23 20:40 ` Rick Jones
2010-03-23 20:54 ` Eric Dumazet
2010-03-23 21:18 ` Eric Dumazet
2010-03-23 21:45 ` David Miller [this message]
2010-03-23 22:08 ` Duyck, Alexander H
2010-03-24 2:58 ` David Miller
2010-03-24 5:42 ` Eric Dumazet
2010-03-24 6:10 ` David Miller
2010-03-23 22:13 ` Eric Dumazet
2010-05-21 15:43 ` Stephen Hemminger
2010-05-21 16:44 ` Eric Dumazet
2010-05-21 17:38 ` Stephen Hemminger
2010-05-21 17:40 ` Eric Dumazet
2010-06-02 9:48 ` Eric Dumazet
2010-06-02 9:49 ` [PATCH 1/2 net-next-2.6] net: Define accessors to manipulate QDISC_STATE_RUNNING Eric Dumazet
2010-06-02 10:24 ` David Miller
2010-06-02 9:50 ` [PATCH 2/2 net-next-2.6] net: QDISC_STATE_RUNNING dont need atomic bit ops Eric Dumazet
2010-06-02 10:25 ` David Miller
2010-03-24 14:24 ` [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness Eric Dumazet
2010-05-21 15:08 ` [PATCH] net: add additional lock to qdisc to increase throughput Eric Dumazet
2010-05-21 20:04 ` Duyck, Alexander H
2010-06-02 12:10 ` David Miller
2010-06-02 14:52 ` Eric Dumazet
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