From: Octavian Purdila <opurdila@ixiacom.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: netdev@vger.kernel.org
Subject: Re: network card with LRO (and TSO) in hardware?
Date: Thu, 29 May 2008 21:11:01 +0300 [thread overview]
Message-ID: <200805292111.01690.opurdila@ixiacom.com> (raw)
In-Reply-To: <483EE9B3.80201@hp.com>
On Thursday 29 May 2008, Rick Jones wrote:
>
> That second bit sounds very much like a "how long is a piece of string"
> question. What size packets? What sort of host system(s)? How many
> concurrent flows/connections etc etc etc...
>
No restrictions... Any packet size (though I presume the lower the better),
any kind of host systems, any number of concurrent flows (though I presume
the fewer the better). I am just wondering what is the maximum packet rate
ever seen by somebody, with hardware LRO.
I am asking this because, theoretically, with hardware LRO we should be able
to achieve a very high packet rate when using a low MTU (like 64 or 128
bytes). With software LRO I got a significant PPS increase for TCP traffic -
from 100K (that with terrible hacks - generating traffic from kernel) to
140K (that cleanly, from user-space). So I am wondering what the hardware LRO
will do.
Thanks,
tavi
prev parent reply other threads:[~2008-05-29 18:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-29 17:04 network card with LRO (and TSO) in hardware? Octavian Purdila
2008-05-29 17:36 ` Rick Jones
2008-05-29 18:11 ` Octavian Purdila [this message]
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