Greg Whalin wrote:
> We have seen the exact same thing here. We used the deadline
> scheduler and saw an immediate improvement. However, we still saw
> much worse performance on our Opteron's (compared to our older Xeon
> boxes). We ended up rolling back to Fedora Core 1
> 2.4.22-1.2199.nptlsmp kernel and shut down NPTL and now our Opteron's
> are much much faster than our Xeons.
Sweet... I'm going to take a look at that!
Two votes for the deadline scheduler. Though I'm an NPTL fan but I'm not sure our DB
boxes need this as they don't use THAT many threads.
> The thing I find strange about this is that our experience (@ Meetup)
> seems to match that of Friendsters (I know of a few other high traffic
> sites that have mentioned similar issues), in that Mysql on Opteron
> and Linux 2.6 is not a good solution. Yet, Mysql recommends exactly
> this config and in fact, does not seem to even support (via support
> contract) a 2.4 solution for Opteron + Mysql.
Wow... whats the consensus on Opteron here then? It seems to be a clear winner since you
can give the mysql process more memory for caching.
Is it an OS issue since few of the distributions seem to support Opteron (well).
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