From: Roland Dreier <rdreier@cisco.com>
To: Andi Kleen <ak@suse.de>
Cc: Krishna Kumar2 <krkumar2@in.ibm.com>, netdev@vger.kernel.org
Subject: Re: [RFC] New driver API to speed up small packets xmits
Date: Tue, 15 May 2007 09:25:28 -0700 [thread overview]
Message-ID: <adatzuerr47.fsf@cisco.com> (raw)
In-Reply-To: <200705130800.44595.ak@suse.de> (Andi Kleen's message of "Sun, 13 May 2007 08:00:44 +0200")
> > As I said before, getting multiple packets in one call to xmit would
> > be nice for amortizing per-xmit overhead in IPoIB. So it would be
> > nice if the cases where the stack does GSO ended up passing all the
> > segments into the driver in one go.
>
> Well TCP does upto 64k -- that is what GSO is about.
I see... the plan would be to add NETIF_F_GSO_SOFTWARE to the device
features and use skb_gso_segment() in the netdevice driver? (I just
studied GSO more carefully -- I hadn't realized that was possible)
I'll have to think about implementing that for IPoIB. One issue I see
is if I have, say, 4 free entries in my send queue and skb_gso_segment()
gives me back 5 packets to send. It's not clear I can recover at that
point -- I guess I have to check against gso_segs in the xmit routine
before actually doing the segmentation.
- R.
next prev parent reply other threads:[~2007-05-15 16:25 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-10 14:53 [RFC] New driver API to speed up small packets xmits 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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2007-05-11 7:14 Krishna Kumar2
[not found] <OF0CAD6D87.DBE62968-ON872572DC.0073646A-882572DC.0073BEC2@us.ibm.com>
2007-05-15 21:17 ` 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
[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
2007-05-22 23:12 ` Herbert Xu
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