Messages in this thread |  | | Date | Tue, 31 Oct 2000 13:13:45 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: 2.2.18Pre Lan Performance Rocks! |
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"Jeff V. Merkey" wrote: > > Pavel Machek wrote: > > > > Hi! > > > > > > > This is putrid. NetWare does 353,00,000/second on a Xenon, pumping out > > > > > gobs of packets in between them. MANOS does 857,000,000/second. This > > > > > is terrible. No wonder it's so f_cking slow!!! > > > > > > And please check your numbers, 857 million > > > > context switches per second means that on a 1 GHZ CPU you do one context > > > > switch per 1.16 clock cycles. Wow! > > > > > > Excuse me, 857,000,000 instructions executed and 460,000,000 context > > > switches > > > a second -- on a PII system at 350 Mhz. It's due to AGI > > > optimization. > > > > That's more than one context switch per clock. I do not think > > so. Really go and check those numbers. > > Pavel, The optimization exploits the multiple piplines in Intel's > processors, > and yes, it does execute more than one instruction per clock, it's > optimized > to execute in the processors parallel pipelines. The EMON numbers are > accurate, > and you can download the kernel and verify for yourself. These types of > optimizations > are possible when people have acccess to Intel Red Cover documents, then > you > get to know just how Intel's internal architectures are affected by > different coding optimizations. > > Jeff
There's also another optimization in this kernel that allows it to achieve greater than 100% scaling per processor by using a strong affinity algorithm (I hold the patent on this algorithimn, and by posting code based on it under the GPL, I have released it to the general public).
It relies on an anomoly in the design of Intel's cache controllers, and with memory based applications, I can get 120% scaling per procesoor by jugling the working set of executable code cached accros each processor. There's sample code with this kernel you can use to verify....
:-)
Jeff
> > Pavel > > -- > > I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." > > Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org - 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/
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