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 !

[Kristian Elof Sørensen]

VJ wrote:

>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.
>  
>
That was my first thought too, since I had a problem with the 2.4.27 
kernel refusing to use dma for the backup disk for some bizarre reason.

However hdparm -c and -d reports that 32 bit data transfer and dma are 
being used.



>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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>>
>>    
>>
>
>
>  
>