The CPU is hit most by the comrpession scheme when using cpool, then by the
rsync checksums and then by the ssh session. If you use an IDE interface or
a SATA in IDE mode then you will be using more CPU. If you are not using
DMA and your disks are stuck in PIO (do hdparm /dev/disk0 to see) then you
are really going to eat up CPU cycles.
You might also have a slow drive controller.
The bump in CPU and RAM was obviously a good thing. More ram allows linux
to be more swappy and frees up more ram for the system to use in disk
caching.
I did something to my machine recently that did wonders for my backup
performance. I baught an Adaptec PCIe Raid card (31205) with 256MB of
cache. The 8x PCIe interface completely removes a bottleneck there, the
cache is awesome for I/O as it buffers I/O latency which backuppc is very
vulnerable too. I migrated my old 4 disk raid5 into a 5 disk raid5ee which
is a fancy way adaptec uses a hot spare to improve performance.
My backup times dropped from about 3 hours to well under 2. something like
a 40% improvement. Considering it is still a 4 disk raid5 + hot spare and
the drives are comparable this is a rather huge gain.
On Fri, Mar 6, 2009 at 6:56 PM, Adam Goryachev <
[email protected]> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Reinhold Schoeb wrote:
> > you were right. I added 2 Gigs of RAM and a new CPU (Athlon 5050e, dual
> core,
> > 2.6 GHz). Now I get about 23 MB/sec transfer speed, which results in 16
> hours
> > for a full backup.
> >
> > So finally I have to say that BackupPC is very dependent on CPU power.
>
> Don't forget that some HDD interfaces are very CPU intensive, so you may
> use 40% CPU just to deal with the IO, plus you need CPU to handle your
> network interface, plus you also need CPU to do the compression of file,
> SSH encryption, etc....
>
> Also, you might like to check your memory usage during a backup, mainly
> to ensure that you are not using any swap space (anything more than a
> couple of megs swap space will mean you need more RAM)...
>
> Regards,
> Adam
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>
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