Paul Jakma wrote:
>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).
>>Is there an option missing? I think the G5 machines are supported in
linux now.. possibly even in 64bit mode properly.
>>>>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?)
>>>And to add to that, on 32 bit x86, you're using PAE to get to it (maybe
that's what you mean by all that technical mumbo jumbo :))
L.
>regards,
>>
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!
