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Re: IO scheduling [message #6908 is a reply to message #6668]

Wed, 27 September 2006 11:04

wfischer
Messages: 38
Registered: November 2005
Location: Austria/Germany

Member

Another question regarding io scheduler:

To me it seems that OpenVZ uses anticipatory io scheduler as default io scheduler, according to the info in /var/log/messages after booting OpenVZ kernel (on a CentOS 4.4 host):
Sep 22 09:14:04 wc1 kernel: Using anticipatory io scheduler

I'm not an expert on io scheduling, but I heard that anticipatory io scheduler is mainly useful for desktop machines and for servers deadline or cfq schedulers should be used.

Could you give a short explanation why anticipatory io scheduler is used as default io scheduler in OpenVZ?

Thanks,
best wishes,
Werner

added remark: I just noticed that the anticipatory io scheduler has different default values in OpenVZ than in vanilla kernel (read_expire 10 instead of 125, read_batch_expire 10 instead of 500) - according to the suggestion on http://bugzilla.kernel.org/show_bug.cgi?id=5900#c1

Werner Fischer, Developer of a Virtuozzo-out-of-the-box-cluster solution at Thomas-Krenn.AG

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[Updated on: Wed, 27 September 2006 11:14]

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[Message index]

		SOLVED IO scheduling By: dagr on Wed, 20 September 2006 18:25
		Re: IO scheduling By: Vasily Tarasov on Thu, 21 September 2006 06:43
		Re: IO scheduling By: wfischer on Wed, 27 September 2006 11:04
		Re: IO scheduling By: Vasily Tarasov on Wed, 27 September 2006 11:41
		Re: IO scheduling By: wfischer on Wed, 27 September 2006 12:17
		Re: IO scheduling By: dagr on Thu, 21 September 2006 07:22
		Re: IO scheduling By: Vasily Tarasov on Thu, 21 September 2006 08:03
		Re: IO scheduling By: HaroldB on Mon, 25 September 2006 07:05
		Re: SOLVED IO scheduling By: HaroldB on Wed, 27 September 2006 11:29

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