linux-kernel - Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

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Message-ID: <20131015120404.GA2402@gmail.com>
Date:	Tue, 15 Oct 2013 14:04:04 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Joe Perches <joe@...ches.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	linux-kernel@...r.kernel.org, sebastien.dugue@...l.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's


* Borislav Petkov <bp@...en8.de> wrote:

> On Tue, Oct 15, 2013 at 09:41:23AM +0200, Ingo Molnar wrote:
> > Most processors have hundreds of cachelines even in their L1 cache.
> > Thousands in the L2 cache, up to hundreds of thousands.
> 
> Also, I have this hazy memory of prefetch hints being harmful in some
> situations: https://lwn.net/Articles/444344/

Yes, for things like random list walks they tend to be harmful - the 
hardware is smarter.

For something like a controlled packet stream they might be helpful.

Thanks,

	Ingo
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