MySQL slow queries, small tables

Dave Smith dave at thesmithfam.org
Tue Jun 10 14:45:24 MDT 2008


Matthew Walker wrote:
> On Tue, June 10, 2008 2:38 pm, Dave Smith wrote:
>   
>> No difference. I've tried nice and ionice (sorry, should have mentioned
>> that earlier).
>>     
>
> What scheduler is your kernel using?

Great question. I've tried it with cfq and deadline by echo'ing into 
/sys/block/hda/queue/scheduler. No improvement there.

I just noticed that vim also suffers like MySQL. If I open a new file in 
vim, add a line of text and run :w, it can take 1 minute to save while 
'cat /dev/zero > /tmp/foo.bin' is running. I think it's probably related 
to this ext3 fsync bug (thanks Byron for pointing that out to me):

    http://shaver.off.net/diary/2008/05/25/fsyncers-and-curveballs/

I am now thinking I need to put my MySQL data on a separate partition of 
its own (so it doesn't have to share a file system with evil doers like 
cat).

--Dave



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