From: Eric Dumazet <eric.dumazet@gmail.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: Vimalkumar <j.vimal@gmail.com>,
davem@davemloft.net, Jamal Hadi Salim <jhs@mojatatu.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH] htb: improved accuracy at high rates
Date: Sat, 20 Oct 2012 09:26:34 +0200 [thread overview]
Message-ID: <1350717994.13333.298.camel@edumazet-glaptop> (raw)
In-Reply-To: <5081E7A8.2080009@hp.com>
On Fri, 2012-10-19 at 16:52 -0700, Rick Jones wrote:
> Did it really take 20 concurrent netperf UDP_STREAM tests to get to
> those rates? And why UDP_STREAM rather than TCP_STREAM?
>
> I couldn't recall if GSO did anything for UDP, so did some quick and
> dirty tests flipping GSO on and off on a 3.2.0 kernel, and the service
> demands didn't seem to change. So, with 8000 bytes of user payload did
> HTB actually see 8000ish byte packets, or did it actually see a series
> of <= MTU sized IP datagram fragmentsOn 10/19/2012 03:26 PM, Vimalkumar wrote:
UFO is quite a virtual feature for the moment ;)
To my knowledge only one driver uses it (neterion/s2io.c)
So most probably HTB sees the fragments built by the stack before
queueing packets to the qdisc layer.
tcpdump can be used to check this.
next prev parent reply other threads:[~2012-10-20 7:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-19 22:26 [PATCH] htb: improved accuracy at high rates Vimalkumar
2012-10-19 23:52 ` Rick Jones
2012-10-20 0:51 ` Vimal
2012-10-22 17:35 ` Rick Jones
2012-10-20 7:26 ` Eric Dumazet [this message]
2012-10-20 16:41 ` Vimal
2012-10-20 7:47 ` Eric Dumazet
2012-10-20 10:29 ` Eric Dumazet
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