From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Maciej Żenczykowski" <maze@google.com>
Cc: David Miller <davem@davemloft.net>,
ilpo.jarvinen@helsinki.fi, rick.jones2@hp.com,
netdev@vger.kernel.org, therbert@google.com,
ncardwell@google.com, ycheng@google.com
Subject: Re: [RFC] allow skb->head to point/alias to first skb frag
Date: Thu, 26 Apr 2012 14:32:34 +0200 [thread overview]
Message-ID: <1335443554.2775.33.camel@edumazet-glaptop> (raw)
In-Reply-To: <CANP3RGdnZk5b-gMkF8BPScrp9xos4X1u3n58ocuBQhTT7taE8A@mail.gmail.com>
On Thu, 2012-04-26 at 03:09 -0700, Maciej Żenczykowski wrote:
> it would be very useful if there was an api for freeing skb->head memory...
>
> I've fooled around with a single memory buffer for both the head and
> the data and seen huge performance wins under heavy packet load (half
> the amount of malloc/free), but could never quite get it to be 100%
> stable.
My patch is almost ready, and seems very good.
I added a param to skb_build() to tell the memory comes from a (sub)page
tg3 uses the new thing.
GRO does the correct merging.
(by the way, I noticed GRO lies about skb truesize... since it
accumulates frag lengths instead of allocated space... with a 1448/2048
mismatch for MTU=1500)
And this apparently solves my slub performance issue I had on my dual
quad core machine, since I no longer hit slub slow path.
next prev parent reply other threads:[~2012-04-26 12:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 9:38 [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP Eric Dumazet
2012-04-23 17:14 ` Rick Jones
2012-04-23 17:23 ` Eric Dumazet
2012-04-23 20:01 ` David Miller
2012-04-23 20:37 ` Eric Dumazet
2012-04-23 20:57 ` Rick Jones
2012-04-23 21:30 ` Eric Dumazet
2012-04-23 21:51 ` Rick Jones
2012-04-23 21:56 ` Rick Jones
2012-04-23 22:05 ` Eric Dumazet
2012-04-23 22:16 ` Rick Jones
2012-04-24 15:25 ` Christoph Lameter
2012-04-23 21:01 ` David Miller
2012-04-23 21:38 ` Eric Dumazet
2012-04-24 2:20 ` Eric Dumazet
2012-04-24 2:27 ` David Miller
2012-04-24 8:01 ` Ilpo Järvinen
2012-04-24 8:10 ` David Miller
2012-04-24 8:21 ` Ilpo Järvinen
2012-04-24 8:25 ` David Miller
2012-04-24 8:40 ` Ilpo Järvinen
2012-04-24 8:48 ` David Miller
2012-04-24 10:32 ` Ilpo Järvinen
2012-04-24 8:56 ` Eric Dumazet
2012-04-26 8:10 ` [RFC] allow skb->head to point/alias to first skb frag Eric Dumazet
2012-04-26 8:36 ` David Miller
2012-04-26 9:10 ` Eric Dumazet
2012-04-26 9:18 ` David Miller
2012-04-26 9:22 ` Eric Dumazet
2012-04-26 10:09 ` Maciej Żenczykowski
2012-04-26 12:32 ` Eric Dumazet [this message]
2012-04-26 13:50 ` Eric Dumazet
2012-04-26 20:12 ` David Miller
2012-04-26 20:18 ` Eric Dumazet
2012-04-24 8:49 ` [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP Eric Dumazet
2012-04-24 8:44 ` David Laight
2012-04-24 8:53 ` Eric Dumazet
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