From: "David S. Miller" <davem@redhat.com>
To: Arthur Kepner <akepner@sgi.com>
Cc: netdev@oss.sgi.com
Subject: Re: [PATCH] "lockless loopback" patch for 2.6.6
Date: Fri, 21 May 2004 14:45:57 -0700 [thread overview]
Message-ID: <20040521144557.6a2c6a02.davem@redhat.com> (raw)
In-Reply-To: <Pine.SGI.4.56.0405211356440.8333289@neteng.engr.sgi.com>
On Fri, 21 May 2004 14:04:09 -0700
Arthur Kepner <akepner@sgi.com> wrote:
> Lock contention on the loopback device can lead to poor
> performance, even an essentially hung system, on systems
> with many processors.
>
> For the loopback device, the only purpose that locking serves
> is to protect the device statistics. The attached patch
> keeps per-cpu statistics for the loopback device and removes
> all locking. The patch is against 2.6.6.
It is legal to attach queueing disciplines to the loopback device
but your patch makes that impossible.
I don't think it is worth worrying about things like this especially
if you're going to be adding ugly loopback special cases to the
generic device handling code like this.
next prev parent reply other threads:[~2004-05-21 21:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-11 19:57 [PATCH] fix "ethtool -S" for tg3 Arthur Kepner
2004-05-12 19:08 ` David S. Miller
2004-05-12 20:00 ` Arthur Kepner
2004-05-20 4:26 ` David S. Miller
2004-05-21 21:04 ` [PATCH] "lockless loopback" patch for 2.6.6 Arthur Kepner
2004-05-21 21:45 ` Stephen Hemminger
2004-05-21 21:45 ` David S. Miller [this message]
2004-05-22 12:20 ` Andi Kleen
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