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Subject: Re: [RFC PATCH net-2.6.25 uncompilable] [TCP]: Avoid breaking
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From: "Lachlan Andrew" <lachlan.andrew@gmail.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.