From: Eric Dumazet <eric.dumazet@gmail.com>
To: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: "Alexander Duyck" <alexander.duyck@gmail.com>,
"David Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
"Neal Cardwell" <ncardwell@google.com>,
"Tom Herbert" <therbert@google.com>,
"Jeff Kirsher" <jeffrey.t.kirsher@intel.com>,
"Michael Chan" <mchan@broadcom.com>,
"Matt Carlson" <mcarlson@broadcom.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"Ben Hutchings" <bhutchings@solarflare.com>,
"Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>,
"Maciej Żenczykowski" <maze@google.com>
Subject: Re: [PATCH 3/4 v2 net-next] net: make GRO aware of skb->head_frag
Date: Wed, 02 May 2012 04:45:03 +0200 [thread overview]
Message-ID: <1335926703.22133.39.camel@edumazet-glaptop> (raw)
In-Reply-To: <4FA03D69.6060907@intel.com>
On Tue, 2012-05-01 at 12:45 -0700, Alexander Duyck wrote:
> I wasn't worried about the kfree vs put_page, I was worried about the
> coalesce case. However, it looks like you are correct and I am not
> seeing any issues so everything seems to be working fine.
>
> I have a hacked together ixgbe up and running now with the new build_skb
> logic and RSC/LRO disabled. It looks like it is giving me a 5%
> performance boost for small packet routing, but I am using more CPU for
> netperf TCP receive tests and I was wondering if you had seen anything
> similar on the tg3 driver?
>
Hmm, tg3 perf for small packets is not changed, because tg3 uses
copybreak anyway.
#define TG3_RX_COPY_THRESHOLD 256
For big packets, I have no changes in netperf because GRO cannot really
provide big enough skbs at 1Gb speed.
The changes are noticeable when BDP (Bandwidth*Delay Product) is large
and some packet losses happen : You notice lower latencies in TCP stack,
because of less collapses (big copies)
next prev parent reply other threads:[~2012-05-02 2:45 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-27 10:37 [PATCH 3/4 net-next] net: make GRO aware of skb->head_frag Eric Dumazet
2012-04-30 17:54 ` Eric Dumazet
2012-04-30 18:10 ` [PATCH 3/4 v2 " Eric Dumazet
2012-04-30 23:36 ` Alexander Duyck
2012-05-01 1:27 ` Eric Dumazet
2012-05-01 5:33 ` Alexander Duyck
2012-05-01 6:39 ` Eric Dumazet
2012-05-01 16:17 ` Alexander Duyck
2012-05-01 17:04 ` Eric Dumazet
2012-05-01 19:45 ` Alexander Duyck
2012-05-02 2:45 ` Eric Dumazet [this message]
2012-05-02 8:24 ` Eric Dumazet
2012-05-02 16:16 ` Alexander Duyck
2012-05-02 16:19 ` Eric Dumazet
2012-05-02 16:27 ` Eric Dumazet
2012-05-02 17:04 ` Alexander Duyck
2012-05-02 17:02 ` Alexander Duyck
2012-05-02 17:16 ` Rick Jones
2012-05-01 22:58 ` Alexander Duyck
2012-05-01 23:10 ` Alexander Duyck
2012-05-02 2:47 ` Eric Dumazet
2012-05-02 3:54 ` Eric Dumazet
2012-05-02 8:13 ` [PATCH net-next] net: take care of cloned skbs in tcp_try_coalesce() Eric Dumazet
2012-05-02 15:52 ` Alexander Duyck
2012-05-02 16:12 ` Eric Dumazet
2012-05-02 16:27 ` Alexander Duyck
2012-05-02 16:46 ` Eric Dumazet
2012-05-02 17:55 ` [PATCH v2 " Eric Dumazet
2012-05-02 19:58 ` [PATCH net-next] net: implement tcp coalescing in tcp_queue_rcv() Eric Dumazet
2012-05-02 20:11 ` Joe Perches
2012-05-02 20:23 ` Eric Dumazet
2012-05-02 20:34 ` Joe Perches
2012-05-03 0:32 ` David Miller
2012-05-03 1:11 ` David Miller
2012-05-03 2:14 ` Eric Dumazet
2012-05-03 2:21 ` David Miller
2012-05-03 1:11 ` [PATCH v2 net-next] net: take care of cloned skbs in tcp_try_coalesce() David Miller
2012-05-02 18:05 ` [PATCH " Alexander Duyck
2012-05-02 18:15 ` Eric Dumazet
2012-05-02 20:55 ` Alexander Duyck
2012-05-03 1:52 ` Eric Dumazet
2012-05-03 3:00 ` Alexander Duyck
2012-05-03 3:14 ` Eric Dumazet
2012-05-03 3:28 ` Alexander Duyck
2012-05-01 1:48 ` [PATCH 3/4 v2 net-next] net: make GRO aware of skb->head_frag David Miller
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