linux-kernel - Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

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Date:	Sat, 9 Aug 2008 22:29:18 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Wolfgang Walter <wolfgang.walter@...m.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"vegard.nossum@...il.com" <vegard.nossum@...il.com>,
	austin zhang <austin_zhang@...ux.intel.com>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

On Sat, Aug 09, 2008 at 08:38:30AM +0800, Herbert Xu wrote:
>
> If there is a significant degradation I suggest that we back out
> the FPU changes.  Making your competitor's processor go slow is
> not a nice thing to do, especially when you've just released a
> processor in the same space.

OK I take that back, Intel (and AMD) processors are equally affected
by this.  For a start, the newly added Intel crc32c driver suffers
from exactly the same problem since the instruction used is also
SSE.

According to

	http://softwarecommunity.intel.com/articles/eng/3788.htm

the Intel AES instructions are also SSE so they too will suffer
from this.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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