Be careful here, we've seen that with the P4 Xeon's that are hyper-threaded and a system that has very high disk I/O causes the system to be sluggish and slow. But after disabling the hyper-threading itself, our system flew..
Anybody has opteron working? Hows' the performance?
Yes. I'm using an 2x 1.8GHz Opteron system w/ 8GB of RAM. Right now, I'm still using 32-bit Linux -- I'm letting others be the 64-bit guinea pigs. :) I probably will get a cheapie 1x Opteron machine first and test the 64-bit kernel/libraries thoroughly before rolling it out to production.
As for performance, the scaling is magnificient -- even when just using PAE instead of 64-bit addressing. At low transaction counts, it's only ~75% faster than the 2x Athlon 1800+ MP it replaced. But once the transactions start coming in, the gap is as high as 5x. My w-a-g: since each CPU has an integrated memory controller, you avoid memory bus contention which is probably the major bottleneck as transaction load increases. (I've seen Opteron several vs Xeon comparisons where single-connection tests are par for both CPUs but heavy-load tests favor the Opteron by a wide margin.) I suspect the 4X comparisons would tilt even more towards AMD's favor.
We should see a boost when we move to 64-bit Linux and hopefully another one when NUMA for Linux is production-stable.
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