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Date: Wed, 26 May 2004 15:00:40 -0700
From: "David S. Miller" <davem@redhat.com>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: net_device->queue_lock contention on 32-way box
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On Wed, 26 May 2004 14:47:15 -0700
"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote:

> Could netif_schedule() take long time to run?

No, it's a series of a few atomic operations.

1) test_and_set_bit()
2) disable cpu interrupts
3) Link list insertion
4) Set a local-cpu flag
5) re-enable cpu interrupts