From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
To: Johann Baudy <johaahn@gmail.com>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: Packet mmap: TX RING and zero copy
Date: Wed, 3 Sep 2008 17:27:34 +0400 [thread overview]
Message-ID: <20080903132734.GA17541@2ka.mipt.ru> (raw)
In-Reply-To: <7e0dd21a0809030605odc28306re8b7640f0632ac36@mail.gmail.com>
Hi Johann.
On Wed, Sep 03, 2008 at 03:05:07PM +0200, Johann Baudy (johaahn@gmail.com) wrote:
> TCP socket, transferring 20Mbytes file (located in initramfs) in loop
> with sendfile() : 5.7Mbytes/s
And _THIS_ is a serious problem. Let's assume that sendfile is broken or
driver/hardware does not support scatter/gather and checksumming (does it?).
Can you saturate the link with pktgen (1) and usual tcp socket (2).
Assuming second case will fail, does it also broken because of very
small performance of the copy from the userspace?
--
Evgeniy Polyakov
next prev parent reply other threads:[~2008-09-03 13:28 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-02 18:27 Packet mmap: TX RING and zero copy Johann Baudy
2008-09-02 19:46 ` Evgeniy Polyakov
2008-09-03 7:56 ` Johann Baudy
2008-09-03 10:38 ` Johann Baudy
2008-09-03 11:06 ` David Miller
2008-09-03 13:05 ` Johann Baudy
2008-09-03 13:27 ` Evgeniy Polyakov [this message]
2008-09-03 14:57 ` Christoph Lameter
2008-09-03 15:00 ` Johann Baudy
2008-09-03 15:13 ` Evgeniy Polyakov
2008-09-03 15:58 ` Johann Baudy
2008-09-03 16:43 ` Evgeniy Polyakov
2008-09-03 20:30 ` Johann Baudy
2008-09-03 22:03 ` Evgeniy Polyakov
2008-09-04 14:44 ` Johann Baudy
2008-09-05 7:17 ` Evgeniy Polyakov
[not found] ` <7e0dd21a0809050216r65b8f08fm1ad0630790a13a54@mail.gmail.com>
2008-09-05 9:17 ` Fwd: " Johann Baudy
2008-09-05 11:31 ` Evgeniy Polyakov
2008-09-05 12:44 ` Johann Baudy
2008-09-05 13:16 ` Evgeniy Polyakov
2008-09-05 13:29 ` Johann Baudy
2008-09-05 13:37 ` Evgeniy Polyakov
2008-09-05 13:55 ` Johann Baudy
2008-09-05 14:19 ` Evgeniy Polyakov
2008-09-05 14:45 ` Johann Baudy
2008-09-05 14:59 ` Evgeniy Polyakov
2008-09-05 15:30 ` Johann Baudy
2008-09-05 15:38 ` Evgeniy Polyakov
2008-09-05 16:01 ` Johann Baudy
2008-09-05 16:34 ` Evgeniy Polyakov
2008-09-08 10:21 ` Johann Baudy
2008-09-08 11:26 ` Evgeniy Polyakov
2008-09-08 13:01 ` Johann Baudy
2008-09-08 15:28 ` Evgeniy Polyakov
2008-09-08 15:38 ` Evgeniy Polyakov
2008-09-09 23:11 ` Johann Baudy
2008-09-10 6:09 ` Evgeniy Polyakov
2008-09-05 10:28 ` Robert Iakobashvili
2008-09-05 13:06 ` Johann Baudy
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