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Re: Handling multiple cores by GRUB

From: address@hidden
Subject: Re: Handling multiple cores by GRUB
Date: Fri, 16 Oct 2009 11:18:39 -0500

On Thu, Oct 15, 2009 at 11:44 AM, James Courtier-Dutton
<address@hidden> wrote:
> 2009/10/14 Robert Millan <address@hidden>:
>> But I don't think this would be desireable except in very specific 
>> situations,
>> and I'm not sure which ones.  Perhaps loading a compressed file would be an
>> example (so that uncompression and disk poll can be done in parallel).
> Not specifically related, but why is grub reading a file from a USB
> stick so slow when compared with say reading the HD.
> I mean slow, it is about 20 times slower here.

What model USB stick?  Consumer-grade NAND flash controllers really
are 10-15x slower than a recent SATA hard disk.  (7MB/s vs 110MB/s on
read).  Only the expensive SSD, which access many NAND flash chips in
parallel, can meet or exceed hard disk speeds.  And USB 2.0 High Speed
maxes out at about 1/3 of hard disk speed, Firewire 800 or USB 3.0
Ultra or eSATA would overcome that.  But most likely you are just
using slow flash memory with a cheap controller.

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