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

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Date:	Sun, 19 Aug 2007 18:45:24 -0700
From:	"Felix Marti" <felix@...lsio.com>
To:	"Andi Kleen" <andi@...stfloor.org>
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.



> -----Original Message-----
> From: ak@...e.de [mailto:ak@...e.de] On Behalf Of Andi Kleen
> Sent: Sunday, August 19, 2007 4:28 PM
> To: Felix Marti
> Cc: David Miller; 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)
Hi Andi, yes, you're right. I should have chosen my example more
carefully.

> 
> -Andi
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