netdev - Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices?

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Message-Id: <20100115.011829.03057807.davem@davemloft.net>
Date:	Fri, 15 Jan 2010 01:18:29 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	krkumar2@...ibm.com
Cc:	eric.dumazet@...il.com, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices?

From: Krishna Kumar2 <krkumar2@...ibm.com>
Date: Fri, 15 Jan 2010 14:50:04 +0530

> I wonder if there is some other way to test it. I could test it on
> the card I have, cxgbe, by ethtool F_SG off, and then testing
> this patch with existing code (both with ethtool F_SG off)? Will
> that be enough to get an idea, or I cannot assume this is
> reasonable for real non-sg drivers? I am sure there is a
> degradation, and mentioned that part as a "penalty" for those
> drivers in my patch.

I think such a test would provide useful data by which to judge this
change.
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