netdev - Re: rps perfomance WAS(Re: rps: question

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Message-ID: <20100416071522.GY18855@one.firstfloor.org>
Date:	Fri, 16 Apr 2010 09:15:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, hadi@...erus.ca,
	Rick Jones <rick.jones2@...com>,
	David Miller <davem@...emloft.net>, therbert@...gle.com,
	netdev@...r.kernel.org, robert@...julf.net, andi@...stfloor.org
Subject: Re: rps perfomance WAS(Re: rps: question

> > Come on Changli.
> >
> > How do you wake up a thread on a remote cpu ?
> >
> 
> resched IPI, apparently. But it is async absolutely. and its IRQ
> handler is lighter.

It shouldn't be a lot lighter than the new fancy "queued smp_call_function"
that's in the tree for a few releases. So it would surprise me if it made
much difference. In the old days when there was only a single lock for
s_c_f() perhaps...

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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