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Message-ID: <20070523192816.GA16603@elte.hu> Date: Wed, 23 May 2007 21:28:16 +0200 From: Ingo Molnar <mingo@...e.hu> To: Rene Herman <rene.herman@...il.com> Cc: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, Jeff Garzik <jeff@...zik.org>, Pekka Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH] CDROM: replace jiffies busyloop with msleep * Rene Herman <rene.herman@...il.com> wrote: > The trouble there is that unless you poll the bloody thing like mad > too much of the Q subchannels passes below you and you need a huge > number of retries to get anything out of it. I noticed when I started > adding audio bits that the driver took full seconds to complete some > audio requests while the old driver was snappy in that regard. When I > replaced our sleeping loop with a busy-wait same as the original the > snappyness returned and moreover, reading the TOC from the CD went > from something close to a minute to approximately a second. Thought > that minute was just because I was dealing with an old junk 1-speed > drive... ouch ... then i guess the right approach is to not use jiffies but to use a calculated number of udelay(10) calls or so. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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