From: Andrew Morton <akpm@zip.com.au>
To: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Gigabit Performance 2.4.19-preX - Excessive locks, calls, waits
Date: Mon, 04 Mar 2002 00:16:38 -0800 [thread overview]
Message-ID: <3C832D66.6DC279E@zip.com.au> (raw)
In-Reply-To: <20020304001223.A29448@vger.timpanogas.org>
"Jeff V. Merkey" wrote:
>
> ...
> 34880 total 0.0202
> 28581 default_idle 595.4375
> 1125 __rdtsc_delay 35.1562
> 1094 eth_type_trans 5.2596
> 657 skb_release_data 4.5625
> 378 __make_request 0.2596
> 335 alloc_skb_frame 1.1020
Note how eth_type_trans is now the most expensive function. This
is because it's the first place where the CPU touches the
just-arrived ethernet header.
It would be interesting to add a prefetch() to the driver at the
earliest possible time to get the header read underway. Maybe
the IP header too?
-
next prev parent reply other threads:[~2002-03-04 8:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-04 7:12 Gigabit Performance 2.4.19-preX - Excessive locks, calls, waits Jeff V. Merkey
2002-03-04 8:16 ` Andrew Morton [this message]
2002-03-04 15:04 ` Alan Cox
2002-03-04 17:46 ` Jeff V. Merkey
2002-03-04 18:34 ` Alan Cox
2002-03-04 21:02 ` Jeff V. Merkey
2002-03-04 17:39 ` Martin Josefsson
2002-03-04 18:04 ` Jeff V. Merkey
[not found] <20020304001223.A29448@vger.timpanogas.org.suse.lists.linux.kernel>
2002-03-04 8:28 ` Andi Kleen
2002-03-04 17:41 ` Jeff V. Merkey
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