dump runs at ~ 4 MB pr. second using Fedora Core 2 instead of the ~ 33 MB pr. second I am used to from previous distributions !

[VJ]

What are the settings of your hard disks? Try running hdparm to see and
change. Normally using 32bit drivers and enabling DMA brings dramatic change
in data transfer.
VJ
----- Original Message ----- 
From: "Kristian Elof Sørensen" <elof at image.dk>
To: <fedora-list at redhat.com>
Sent: Sunday, September 12, 2004 1:02 PM
Subject: dump runs at ~ 4 MB pr. second using Fedora Core 2 instead of the ~
33 MB pr. second I am used to from previous distributions !


>
> Problem:
>     dump of an entire partition on one disk to a file on an EIDE disk on
> another controller progresses at the slooow speed of approx. 4 MB pr.
> second
>
>     Using the same kernel on the same machine but with a heavily
> upgraded Redhat 7.3 instead of Fedora Core 2, dump progressed at a rate
> of 16-33,6 MB pr. second depending on which disk was being dumped. Write
> speed to the disk being written to is limited to 33,6 due to long EIDE
> cables.
>
>
> Details:
>
>     During dump with Fedora Core 2 the system load is between 2,2 and
> 3,2, the three dump threads are consuming 1-3% cpu and less than 2 MB of
> memory.
>
>     During dump with Fedora Core 2 free reports that "buffers" is around
> 0,75 GB and "cached" around 0,65 GB during dump. Se below for snapshots.
>
>
>
>
>
> System:
>     Fedora Core 2
>     2.6.8.1 kernel compiled for SMP
>     Dual Athlon
>     1,5 GB RAM
>     1,5 GB swap space
>
>
>
> free:
>
>     before starting dump
>
> bash-2.05b# free
>              total       used       free     shared    buffers     cached
> Mem:       1555436     129140    1426296          0       4460      26456
> -/+ buffers/cache:      98224    1457212
> Swap:      1509352      92368    1416984
>
>
>        while dump is running (the numbers stays pretty much the same for
> the entire run of dump)
>
> bash-2.05b# free
>              total       used       free     shared    buffers     cached
> Mem:       1555436    1547356       8080          0     735380     629692
> -/+ buffers/cache:     182284    1373152
> Swap:      1509352     120756    1388596
>
>
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