[ILUG] ftp.heanet.ie

[Paul Jakma]

On Sat, 10 Jan 2004, Colm MacCarthaigh wrote:

> Buying Alpha at this stage is very risky :) More like an itanium !

Or Opteron, though I dont know how stable x86-64 is. Thing about the
alpha though is that just about all of the host bus chipsets (Pyxis
and up, probably even before Pyxis) have built-in IO-MMUs, which 
probably would be useful for what you are doing :)

Your other (and saner in terms of support) option is sparc64 - i
think most decent Sun sparc64 hardware also has IO-MMUs. No idea how
well linux runs on them though (seems there possibly are actually
people running linux on sparc64 in production judging from posts to
l-k).

> That it is, but we really need the numbers :)

Only the first 4GB, at best, of that physical address space is
IO-able though, as i'm sure you're aware :) the rest has to be bounce
buffered which isnt conducive to performance - whats the remaining
8GB for? (and how, if at all, do you make sure your IO constrained 
processes get allocated at <= 4GB physical?)

regards,
-- 
Paul Jakma	paul at clubi.ie	paul at jakma.org	Key ID: 64A2FF6A
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