netdev - Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS

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Date:	20 Aug 2007 01:27:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Felix Marti" <felix@...lsio.com>
Cc:	"David Miller" <davem@...emloft.net>, jeff@...zik.org,
	netdev@...r.kernel.org, rdreier@...co.com,
	linux-kernel@...r.kernel.org, general@...ts.openfabrics.org
Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCPportsfrom the host TCP port space.

"Felix Marti" <felix@...lsio.com> writes:

> what benefits does the TSO infrastructure give the
> non-TSO capable devices?

It improves performance on software queueing devices between guests
and hypervisors. This is a more and more important application these
days.  Even when the system running the Hypervisor has a non TSO
capable device in the end it'll still save CPU cycles this way. Right now
virtualized IO tends to much more CPU intensive than direct IO so any
help it can get is beneficial.

It also makes loopback faster, although given that's probably not that
useful.

And a lot of the "TSO infrastructure" was needed for zero copy TX anyways,
which benefits most reasonable modern NICs (anything with hardware 
checksumming)

-Andi
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