On Tue, Jan 17, 2006 at 08:38:08PM -0600, Michael Barnett wrote: > It ran fine when we were only throwing a few dozen qps at it... when > we tried to throw about 350qps its way, it was much much slower... > slower than our existing server with significantly fewer resources > available. > > I never could figure out what the issue was... tried recompiling with > different options, allocating more and less memory to mysql (really > to innodb as all our tables are innodb), and a number of system > tweaks to no avail. > > Are you running it on an opteron, or on a xeon? I have heard things > go much smoother on AMD hardware.
I've used it for mysql benchmarking (using supersmack) on amd hardware and got quite good performance from it. I've not used it with a 'real' database on that machine. > Anyways.. the damage is done. We are back on i386 and I just need to > make it go! Right now i am just running with the stable non-PAE > kernel that limits access to 4G of memory while i work this out. It could be a driver issue, although since you're not adding drivers to the PAE config I don't know why this would be. Still, you could post your dmesg so that someone might be able to recognize a problem. Try looking for an updated BIOS. It could be that your HW has a buggy implementation. Kris
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