Messages in this thread |  | | Date | Mon, 30 Oct 2000 02:40:39 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: 2.2.18Pre Lan Performance Rocks! |
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On Mon, Oct 30, 2000 at 11:50:24AM +0100, Ingo Molnar wrote: > > On Mon, 30 Oct 2000, Jeff V. Merkey wrote: > > > ds: and es: are both used in copy-to-user and copy-from-user and they > > get reloaded. > > And they all share the same segment descriptor. Whats your point? ES is > the default target segment for string operations. DS is the default data > segment. Have you ever profiled how many cycles it takes to do a "mov > __KERNEL_DS, %es" in entry.S, before making your (ridiculous) claim? I > have. >
No. I used a hardware analyzer to show me how many LOCK# assertions it does invisible to your software tools underneath. Try using EMON to profile, it gives hardware numbers and let's you watch the cache controllers issue non-cacheable memory references to fetch the descriptors.
Jeff
> Ingo - 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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