From: Alex Sidorenko <alexandre.sidorenko@hpe.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: Receive offloads, small RCVBUF and zero TCP window
Date: Mon, 28 Nov 2016 16:14:04 -0500 [thread overview]
Message-ID: <15427752.RvQkb5CQdb@zbook> (raw)
In-Reply-To: <20161128.155459.1527519991492144879.davem@davemloft.net>
On Monday, November 28, 2016 3:54:59 PM EST David Miller wrote:
> From: Alex Sidorenko <alexandre.sidorenko@hpe.com>
> Date: Mon, 28 Nov 2016 15:49:26 -0500
>
> > Now the question is whether is is OK to have icsk->icsk_ack.rcv_mss
> > larger than MTU.
>
> It absolutely is not OK.
>
> If VMWare wants to receive large frames for batching purposes it must
> use GRO or similar to achieve that, not just send vanilla frames into
> the stack which are larger than the device MTU.
>
As VMWare's vmxnet3 driver is open-sourced and part of generic kernel, do you think the problem is in that driver or elsewhere? I looked at vmxnet3 sources and see that it uses LRO/GRO subroutines. Unfortunately, I don't understand its logic enough to see whether they are doing anything incorrectly.
Alex
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Alex Sidorenko email: asid@hpe.com
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next prev parent reply other threads:[~2016-11-28 21:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-28 20:49 Receive offloads, small RCVBUF and zero TCP window Alex Sidorenko
2016-11-28 20:54 ` David Miller
2016-11-28 21:14 ` Alex Sidorenko [this message]
2016-11-30 15:10 ` Alex Sidorenko
2016-11-28 22:01 ` Marcelo Ricardo Leitner
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