linux-kernel - Re: [PATCH] tweak spin logic for hpilo

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Message-ID: <20090310235659.1fe62b2e@lxorguk.ukuu.org.uk>
Date:	Tue, 10 Mar 2009 23:56:59 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	"Altobelli, David" <david.altobelli@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tweak spin logic for hpilo

> You're using udelay, which is a spin loop. Nothing else can happen on 
> that CPU while it's delaying anyway.

However if your polling is doing I/O its clogging up the I/O busses (and
quite often the bridge)
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