linux-kernel - Re: Disk schedulers

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Message-ID: <47C6EBF3.8080703@tmr.com>
Date:	Thu, 28 Feb 2008 12:14:27 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Linda Walsh <lkml@...nx.org>
CC:	Lukas Hejtmanek <xhejtman@....muni.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: Disk schedulers

Linda Walsh wrote:

>    You didn't say anything about #processors or speed, nor
> did you say anything about your hard disk's raw-io ability.
> You also didn't mention what kernel version or whether or not
> you were using the new UID-group cpu scheduler in 2.6.24 (which likes
> to default to 'on'; not a great choice for single-user, desktop-type
> machines, if I understand its grouping policy).
> Are you sure neither end of the copy is cpu-bound on ssh/scp
> encrypt/decrypt calculations? It might not just be inability
> to read from disk, but low cpu availability.  Scp can be alot
> more CPU intensive than you would expect...  Just something to
> consider...
> 
Good point, and may I note that you *can* choose your encryption, I use 
'blowfish' for normal operation, since I have some faitly slow machines 
with a Gbit net between them.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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