From: Jes Sorensen <jes@linuxcare.com>
To: Jeff Garzik <jgarzik@mandrakesoft.com>
Cc: netdev@oss.sgi.com,
Linux Knernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: New net features for added performance
Date: 01 Mar 2001 22:06:16 +0100 [thread overview]
Message-ID: <d3y9upurlj.fsf@lxplus015.cern.ch> (raw)
In-Reply-To: <3A9842DC.B42ECD7A@mandrakesoft.com>
In-Reply-To: Jeff Garzik's message of "Sat, 24 Feb 2001 18:25:16 -0500"
>>>>> "Jeff" == Jeff Garzik <jgarzik@mandrakesoft.com> writes:
Jeff> 1) Rx Skb recycling. It would be nice to have skbs returned to
Jeff> the driver after the net core is done with them, rather than
Jeff> have netif_rx free the skb. Many drivers pre-allocate a number
Jeff> of maximum-sized skbs into which the net card DMA's data. If
Jeff> netif_rx returned the SKB instead of freeing it, the driver
Jeff> could simply flip the DescriptorOwned bit for that buffer,
Jeff> giving it immediately back to the net card.
Jeff> Advantages: A de-allocation immediately followed by a
Jeff> reallocation is eliminated, less L1 cache pollution during
Jeff> interrupt handling. Potentially less DMA traffic between card
Jeff> and host.
Jeff> Disadvantages?
I already tried this with the AceNIC GigE driver some time ago, and
after Ingo came up with a per-CPU slab patch the gain was gone. I am
not sure the complexity is worth it.
Jes
prev parent reply other threads:[~2001-03-01 21:11 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-24 23:25 New net features for added performance Jeff Garzik
2001-02-24 23:48 ` Andi Kleen
2001-02-25 0:03 ` Jeff Garzik
2001-02-25 0:12 ` Andi Kleen
2000-01-01 0:19 ` Pavel Machek
2001-03-04 1:19 ` LILO error with 2.4.3-pre1 Steven J. Hill
2001-03-04 1:39 ` Keith Owens
2001-03-04 2:27 ` Tom Sightler
2001-03-04 21:32 ` Mircea Damian
2001-03-04 23:05 ` Guest section DW
2001-03-04 2:39 ` Andre Tomt
2001-03-04 3:32 ` Steven J. Hill
2001-03-04 13:35 ` Alan Cox
2001-02-25 0:13 ` New net features for added performance Jeff Garzik
2001-02-25 0:16 ` Andi Kleen
2001-02-25 11:49 ` Rusty Russell
2001-02-26 23:48 ` David S. Miller
2001-02-27 0:03 ` Andi Kleen
2001-02-27 0:08 ` David S. Miller
2001-02-27 2:53 ` Jeremy Jackson
2001-02-27 19:59 ` kuznet
2001-02-25 1:55 ` Michael Richardson
2001-02-25 2:32 ` Jeremy Jackson
2001-02-25 3:23 ` Chris Wedgwood
2001-02-25 12:41 ` Werner Almesberger
2001-02-25 13:57 ` Chris Wedgwood
2001-02-25 2:38 ` Noah Romer
2001-03-03 23:32 ` Jes Sorensen
2001-02-25 12:01 ` Andrew Morton
2001-02-25 15:11 ` Jeremy Jackson
2001-02-25 12:22 ` Werner Almesberger
2001-03-12 15:08 ` Jes Sorensen
2001-02-25 13:08 ` Jonathan Morton
2001-02-26 23:46 ` David S. Miller
2001-02-27 0:07 ` Jeff Garzik
2001-02-27 0:10 ` David S. Miller
2001-03-01 21:06 ` Jes Sorensen [this message]
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