From: Rick Jones <rick.jones2@hp.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: netdev@vger.kernel.org, davem@davemloft.net
Subject: Re: [PATCH] Disable TSO for non standard qdiscs
Date: Thu, 31 Jan 2008 10:35:42 -0800 [thread overview]
Message-ID: <47A214FE.3050200@hp.com> (raw)
In-Reply-To: <20080131190326.GF4671@one.firstfloor.org>
Andi Kleen wrote:
> On Thu, Jan 31, 2008 at 10:26:19AM -0800, Rick Jones wrote:
>
>>Andi Kleen wrote:
>>
>>>TSO interacts badly with many queueing disciplines because they rely on
>>>reordering packets from different streams and the large TSO packets can
>>>make this difficult. This patch disables TSO for sockets that send over
>>>devices with non standard queueing disciplines. That's anything but noop
>>>or pfifo_fast and pfifo right now.
>>
>>Does this also imply that JumboFrames interacts badly with these qdiscs?
>> Or IPoIB with its 65000ish byte MTU?
>
>
> Correct. Of course it is always relative to the link speed. So if your
> link is 10x faster and your packets 10x bigger you can get similarly
> smooth shaping.
So, at what timescale do people using these qdiscs expect things to
appear "smooth?" 64KB of data at GbE speeds is something just north of
half a millisecond unless I've botched my units somewhere.
rick jones
next prev parent reply other threads:[~2008-01-31 18:35 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-31 12:46 [PATCH] Disable TSO for non standard qdiscs Andi Kleen
2008-01-31 17:23 ` Stephen Hemminger
2008-01-31 18:33 ` Andi Kleen
2008-01-31 18:01 ` Patrick McHardy
2008-01-31 18:37 ` Andi Kleen
2008-01-31 18:08 ` Stephen Hemminger
2008-01-31 18:11 ` Patrick McHardy
2008-01-31 18:53 ` Andi Kleen
2008-01-31 18:21 ` Patrick McHardy
2008-01-31 19:01 ` Andi Kleen
2008-01-31 18:47 ` Waskiewicz Jr, Peter P
2008-01-31 19:34 ` Andi Kleen
2008-01-31 19:39 ` Waskiewicz Jr, Peter P
2008-01-31 23:10 ` Arnaldo Carvalho de Melo
2008-01-31 23:42 ` Waskiewicz Jr, Peter P
2008-02-01 4:26 ` Patrick McHardy
2008-02-01 4:35 ` Andi Kleen
2008-02-01 4:36 ` Andi Kleen
2008-01-31 20:33 ` Jarek Poplawski
2008-01-31 23:04 ` Jarek Poplawski
2008-02-01 7:42 ` Jarek Poplawski
2008-02-01 9:28 ` Waskiewicz Jr, Peter P
2008-02-01 21:47 ` Jarek Poplawski
2008-02-01 5:01 ` Andi Kleen
2008-02-01 6:35 ` Glen Turner
2008-02-01 6:46 ` Patrick McHardy
2008-02-01 7:46 ` Andi Kleen
2008-02-01 7:25 ` Patrick McHardy
2008-02-01 9:37 ` Waskiewicz Jr, Peter P
2008-02-01 9:56 ` Patrick McHardy
2008-02-01 12:06 ` jamal
2008-02-01 19:02 ` Waskiewicz Jr, Peter P
2008-02-01 22:56 ` Jarek Poplawski
2008-02-02 1:51 ` Waskiewicz Jr, Peter P
2008-02-02 5:20 ` Andi Kleen
2008-02-01 14:34 ` Andi Kleen
2008-02-01 17:24 ` Stephen Hemminger
2008-01-31 18:48 ` Patrick McHardy
2008-02-02 22:57 ` Herbert Xu
2008-02-03 9:35 ` Andi Kleen
2008-01-31 18:26 ` Rick Jones
2008-01-31 19:03 ` Andi Kleen
2008-01-31 18:35 ` Rick Jones [this message]
2008-01-31 19:25 ` Andi Kleen
2008-01-31 19:14 ` Rick Jones
2008-02-01 1:04 ` Andy Furniss
2008-02-01 4:31 ` Andi Kleen
2008-02-02 22:59 ` Herbert Xu
2008-02-01 21:58 ` Rick Jones
2008-02-02 4:10 ` Andi Kleen
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