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Date: Sat, 28 Oct 2006 11:37:22 -0700 From: Andi Kleen <ak@...e.de> To: Willy Tarreau <w@....eu> Cc: Lee Revell <rlrevell@...-job.com>, thockin@...kin.org, Luca Tettamanti <kronos.it@...il.com>, linux-kernel@...r.kernel.org, john stultz <johnstul@...ibm.com> Subject: Re: AMD X2 unsynced TSC fix? On Friday 27 October 2006 22:28, Willy Tarreau wrote: > On Fri, Oct 27, 2006 at 11:28:00PM -0400, Lee Revell wrote: > > On Fri, 2006-10-27 at 18:04 -0700, Andi Kleen wrote: > > > I don't think it makes too much sense to hack on pure RDTSC when > > > gtod is fast enough -- RDTSC will be always icky and hard to use. > > > > I agree FWIW, our application would be happy to just use gtod if it > > wasn't so slow on these machines. > > Agreed, I had to turn about 20 dual-core servers to single core because > the only way to get a monotonic gtod made it so slow that it was not > worth using a dual-core. Curious - what workload was that? 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. > I initially considered buying one dual-core > AMD for my own use, but after seeing this, I'm definitely sure I won't > ever buy one as long as this problem is not fixed, as it causes too > many problems. It's somewhat slower, but I'm not sure what "too many problems" you're refering to. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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