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April 2008

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Subject:
From:
John Summerfield <[log in to unmask]>
Reply To:
John Summerfield <[log in to unmask]>
Date:
Sun, 13 Apr 2008 19:09:05 +0800
Content-Type:
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John Summerfield wrote:
> It's necessary to boot with pci=nomsi,nommconf but I knew that.
> 
I'll pick them off one by one.

> Disk performance is shocking:
> [root@bobtail ~]# hdparm -t /dev/hd{a,c}
> 
> /dev/hda:
>  Timing buffered disk reads:    8 MB in  3.47 seconds =   2.31 MB/sec
> 
> /dev/hdc:
>  Timing buffered disk reads:   10 MB in  3.67 seconds =   2.72 MB/sec
> [root@bobtail ~]#
> 
> but I think I have a workaround to that on Tikanga-list from a question 
> I asked before buying it.
>
[root@bobtail ~]# cat /proc/cmdline
ro root=/dev/VolGroup00/LogVol00 pci=nomsi,nommconf hda=noprobe 
hdb=noprobe hdc=noprobe  vga=794
[root@bobtail ~]# hdparm -t /dev/sd{a,b}

/dev/sda:
  Timing buffered disk reads:  222 MB in  3.00 seconds =  73.91 MB/sec

/dev/sdb:
  Timing buffered disk reads:  174 MB in  3.01 seconds =  57.79 MB/sec
[root@bobtail ~]#

This is not a xen kernel. However, the xen kernel's about the same.


-- 

Cheers
John

-- spambait
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