Messages in this thread | | | Date | Sun, 29 Apr 2001 12:48:06 -0600 | From | Richard Gooch <> | Subject | Re: X15 alpha release: as fast as TUX but in user space (fwd) |
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Ingo Oeser writes: > On Sun, Apr 29, 2001 at 04:27:48AM -0700, David S. Miller wrote: > > The idea is that the one thing one tends to optimize for new cpus > > is the memcpy/memset implementation. What better way to shield > > libc from having to be updated for new cpus but to put it into > > the kernel in this magic page? > > Hehe, you have read this MXT patch on linux-mm, too? ;-) > > There we have 10x faster memmove/memcpy/bzero for 1K blocks > granularity (== alignment is 1K and size is multiple of 1K), that > is done by the memory controller.
This sounds different to me. Using the memory controller is (should be!) a privileged operation, thus it requires a system call. This is quite different from code in a magic page, which is excuted entirely in user-space. The point of the magic page is to avoid the syscall overhead.
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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