Messages in this thread |  | | Date | Mon, 21 Aug 2000 12:18:23 -0700 (PDT) | From | <> | Subject | Re: 2.4.x SMP scalability question. |
| |
On Sat, 19 Aug 2000, Ingo Molnar wrote: > On Fri, 18 Aug 2000, Matthew Wilcox wrote: > > (From memory, we were acheiving 80%+ scalability on 2 and 4 CPUs and > > then dropped to 65% on the 8 CPU test -- equivalent to using 5 CPUs at > > 100%.) > > i can show you pure user-space workloads that will not scale past 2 CPUs > on any x86 SMP system.
Can you point me/us to any references on the SMP scalability of various workloads and/or how to diagnose them?
I suppose if you're runing 1/2 as slow as you think you should be on a 4 CPU box and you disable two of the CPUs and it doesn't get any slower then you know you've got a scalability problem somewhere. I don't know how I would got about determining that the userspace workload inherantly didn't scale though.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |