netdev - Re: [RFC PATCH net-2.6.25 uncompilable] [TCP]: Avoid breaking GSOed skbs when SACKed one-by-one

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Date:	Wed, 12 Dec 2007 15:38:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	lachlan.andrew@...il.com
Cc:	ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org,
	quetchen@...tech.edu, d.veitch@...unimelb.edu.au
Subject: Re: [RFC PATCH net-2.6.25 uncompilable] [TCP]: Avoid breaking
 GSOed skbs when SACKed one-by-one

From: "Lachlan Andrew" <lachlan.andrew@...il.com>
Date: Wed, 12 Dec 2007 15:35:49 -0800

> I thought that a TSC read was fairly cheap.

The TSC is cheap, but on the vast majority of systems it
isn't usable as a stable time source, and we have to read
the ACPI timer instead.
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