From: David Miller <davem@davemloft.net>
To: xma@us.ibm.com
Cc: ak@suse.de, herbert@gondor.apana.org.au, krkumar2@in.ibm.com,
netdev@vger.kernel.org, netdev-owner@vger.kernel.org,
rdreier@cisco.com
Subject: Re: [RFC] New driver API to speed up small packets xmits
Date: Tue, 22 May 2007 16:04:37 -0700 (PDT) [thread overview]
Message-ID: <20070522.160437.48528737.davem@davemloft.net> (raw)
In-Reply-To: <OFCF3EB7F8.9740C0C7-ON872572E3.007DADF6-882572E3.007E0E7B@us.ibm.com>
From: Shirley Ma <xma@us.ibm.com>
Date: Tue, 22 May 2007 15:58:05 -0700
> Sorry for the confusion. I am thinking to avoid copy in skb_segment() for
> GSO. The way could be in tcp_sendmsg() to allocate small discontiguous
> buffers (equal = MTU) instead of allocating pages.
The SKB splitting algorithm in TCP's transmit engine depends upon the
skb_shared_info() array being splittable at arbitrary points with only
page counts to manage. This is the only way I found to make SKB
splitting at transmit time extremely inexpensive.
SACK block processing needs to perform these kinds of splits
at well, so it really really has to be cheap.
The invariant is that every TCP TSO packet must have it's header
at skb->data and all of it's data in the paged skb_shared_info().
next prev parent reply other threads:[~2007-05-22 23:04 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF0CAD6D87.DBE62968-ON872572DC.0073646A-882572DC.0073BEC2@us.ibm.com>
2007-05-15 21:17 ` [RFC] New driver API to speed up small packets xmits Roland Dreier
[not found] ` <OFF5654BB8.74EC8DCB-ON872572DC.00752079-882572DC.00756B23@us.ibm.com>
2007-05-15 21:25 ` Roland Dreier
[not found] ` <OF21D475A2.5E5C88DE-ON872572DC.00763DE4-882572DC.00768A7E@us.ibm.com>
2007-05-15 21:38 ` David Miller
2007-05-15 21:32 ` David Miller
2007-05-15 22:17 ` [WIP] [PATCH] WAS " jamal
2007-05-15 22:48 ` jamal
2007-05-16 0:50 ` jamal
2007-05-16 22:12 ` Sridhar Samudrala
2007-05-16 22:52 ` jamal
2007-05-17 3:25 ` jamal
2007-05-18 12:07 ` jamal
2007-05-17 4:03 ` Krishna Kumar2
2007-05-16 21:44 ` Sridhar Samudrala
2007-05-17 5:01 ` Krishna Kumar2
[not found] ` <OF6757F56D.EE5984FD-ON872572DC.0081026C-882572DC.00814B8F@us.ibm.com>
2007-05-15 23:36 ` David Miller
2007-05-21 7:56 ` Herbert Xu
[not found] ` <OF9ABCD08D.2CD1B193-ON872572E3.007A6FC1-882572E3.007ACE1A@us.ibm.com>
2007-05-22 22:36 ` David Miller
[not found] ` <OFCF3EB7F8.9740C0C7-ON872572E3.007DADF6-882572E3.007E0E7B@us.ibm.com>
2007-05-22 23:04 ` David Miller [this message]
2007-05-22 23:12 ` Herbert Xu
2007-05-11 7:14 Krishna Kumar2
-- strict thread matches above, loose matches on Subject: below --
2007-05-10 14:53 Krishna Kumar
2007-05-10 15:08 ` Evgeniy Polyakov
2007-05-10 15:22 ` Krishna Kumar2
2007-05-10 15:48 ` Evgeniy Polyakov
2007-05-10 16:08 ` jamal
2007-05-10 17:19 ` Rick Jones
2007-05-10 18:07 ` Sridhar Samudrala
2007-05-10 19:43 ` Gagan Arneja
2007-05-10 20:11 ` jamal
2007-05-10 20:14 ` Rick Jones
2007-05-10 20:15 ` jamal
2007-05-10 20:15 ` Gagan Arneja
2007-05-10 20:21 ` jamal
2007-05-10 20:25 ` Gagan Arneja
2007-05-11 5:22 ` Krishna Kumar2
2007-05-11 11:27 ` jamal
2007-05-10 20:37 ` David Miller
2007-05-10 20:40 ` Gagan Arneja
2007-05-10 20:57 ` David Miller
2007-05-11 6:07 ` Krishna Kumar2
2007-05-11 5:21 ` Krishna Kumar2
2007-05-11 5:20 ` Krishna Kumar2
2007-05-11 5:35 ` Gagan Arneja
2007-05-11 5:43 ` Krishna Kumar2
2007-05-11 5:57 ` Gagan Arneja
2007-05-11 6:06 ` Krishna Kumar2
2007-05-11 6:29 ` Gagan Arneja
2007-05-11 6:52 ` Krishna Kumar2
2007-05-10 18:13 ` Vlad Yasevich
2007-05-10 18:20 ` Rick Jones
2007-05-10 18:32 ` Vlad Yasevich
2007-05-10 18:40 ` Rick Jones
2007-05-10 18:59 ` Ian McDonald
2007-05-10 19:21 ` Vlad Yasevich
2007-05-10 19:26 ` Ian McDonald
2007-05-10 20:32 ` David Miller
2007-05-10 20:49 ` Rick Jones
2007-05-10 21:02 ` David Miller
2007-05-10 21:14 ` Gagan Arneja
2007-05-11 2:28 ` Stephen Hemminger
2007-05-11 5:01 ` Gagan Arneja
2007-05-11 5:04 ` Krishna Kumar2
2007-05-11 9:01 ` Evgeniy Polyakov
2007-05-11 9:18 ` Krishna Kumar2
2007-05-11 9:32 ` Evgeniy Polyakov
2007-05-11 9:52 ` Krishna Kumar2
2007-05-11 9:56 ` Evgeniy Polyakov
2007-05-11 11:30 ` jamal
2007-05-11 11:53 ` Evgeniy Polyakov
2007-05-11 12:15 ` jamal
2007-05-10 21:27 ` David Stevens
2007-05-10 21:40 ` David Miller
2007-05-10 21:50 ` Gagan Arneja
2007-05-10 22:06 ` David Miller
2007-05-11 9:46 ` Krishna Kumar2
2007-05-10 21:41 ` Eric Dumazet
2007-05-10 22:09 ` Rick Jones
2007-05-10 21:45 ` Rick Jones
2007-05-10 21:53 ` David Stevens
2007-05-10 20:21 ` Roland Dreier
2007-05-11 7:30 ` Krishna Kumar2
2007-05-11 11:21 ` Roland Dreier
2007-05-11 9:05 ` Andi Kleen
2007-05-11 8:32 ` Krishna Kumar2
2007-05-11 9:37 ` Andi Kleen
2007-05-11 8:50 ` Krishna Kumar2
2007-05-11 11:16 ` Roland Dreier
2007-05-13 6:00 ` Andi Kleen
2007-05-15 16:25 ` Roland Dreier
2007-05-15 20:18 ` David Miller
2007-05-15 20:52 ` Roland Dreier
2007-05-15 21:48 ` Michael Chan
2007-05-15 21:08 ` Roland Dreier
2007-05-15 22:05 ` Michael Chan
2007-05-15 21:28 ` David Miller
2007-05-18 7:04 ` Michael Chan
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