Re: Status of Opteron vs Xeon

Chris Browne <cbbrowne(at)acm(dot)org> writes:
> jeff(at)frostconsultingllc(dot)com (Jeff Frost) writes:
>> What's the current status of how much faster the Opteron is compared
>> to the Xeons? I know the Opterons used to be close to 2x faster,
>> but is that still the case? I understand much work has been done to
>> reduce the contect switching storms on the Xeon architecture, is
>> this correct?

> Work has gone into 8.1 to try to help with the context switch storms;
> that doesn't affect previous versions.

Also note that we've found that the current coding of the TAS macro
seems to be very bad for at least some Opterons --- they do much better
if the "pre-test" cmpb is removed. But this is not true for all x86_64
chips. We still have an open issue about what to do about this.

regards, tom lane