[CentOS] slugishness

Tue Jul 14 22:08:50 UTC 2009
Scott Silva <ssilva at sgvwater.com>

on 7-3-2009 5:30 AM Jerry Geis spake the following:
> Hi all,
> I have a 3G AM2 quad core CPU... x86_64 centos 5.3
> When I am doing backing up to my external USB drive
> my system becomes sluggish. Clicking on a thunderbird compose
> takes some time to pop up the window. Typing doesn't keep up etc...
> Is there something I can change so this backup doesn't slow my system
> down so much? I don't see HOW it can be taking so much CPU.
> top at times shows 0 idle or 11% idle from a USB backup.
> Thanks for any suggestions.
> Jerry
USB I believe is not a DMA based port, so the processor has to do a lot of
work, especially at higher speeds. Rsync can also be a resource hog, as it
keeps most of the hash tables in memory it uses to compare files with.

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