Re: AMD X2 unsynced TSC fix?

thockin
2006-10-28T19:18:06Z

On Sat, Oct 28, 2006 at 09:15:15PM +0200, Willy Tarreau wrote:
> > While gtod is time critical and often appears high on profile lists it is
> > normally not as time critical as you're claiming it is; especially not
> > time critical enough to warrant such radical action.
>
> Yes it was, because the small gain of using a dual core with such
> a workload was clearly lost by that change. IIRC, I reached 25000
> sessions/s on dual core with TSC if I didn't care about the clock,
> 20000 without TSC, and 18000 on single core+TSC. But with the sniffer,
> it was even worse : I had 500 kpps in dual-core+TSC, 70kpps without
> TSC and 300 kpps with single-core+TSC. Since I had to buy the same
> machines for both uses, this last argument was enough for me to stick
> to a single core.

Was the problem that they were not synced at poweron or that they would
drift due to power-states?

Did you try running with idle=poll, to avoid ever entering C1 state (hlt)?