Messages in this thread |  | | Date | Wed, 10 Oct 2001 08:45:37 -0600 | From | Charles Cazabon <> | Subject | Re: Dual Athlon XP 1800+ on Tyan Thunder K7 or Tiger MP anyone? |
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Robert Love <rml@tech9.net> wrote: > On Tue, 2001-10-09 at 18:17, Charles Cazabon wrote: > > They work, but not "fine". There are performance issues with > > Thunderbird-core Athlons in SMP configurations that may slow them down > > somewhat. > > Are you sure it is related to SMP and not the fact the Palomino core is > faster in general?
Yes, it's an architectural problem with the Thunderbird core. It turns out that in SMP configurations, the Thunderbird can actually hinder performance in certain cases (i.e. benchmarks show very little performance improvement for dual Thunderbirds over single Thunderbird, while same software scales almost linearly with dual Palominos over single Palomino).
I don't recall the exact cause, but I think it had something to do with poor cache interaction -- cache-line ping-pong perhaps?
Charles -- ----------------------------------------------------------------------- Charles Cazabon <linux@discworld.dyndns.org> GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/ ----------------------------------------------------------------------- - 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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