Mailinglist Archive: opensuse-factory (838 mails)

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Re: [opensuse-factory] 11.5 vs. 12.0
On Mon, 14 Mar 2011 21:52:39 +0100
Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@xxxxxxx> wrote:

Auf 12.03.2011 11:23, Stefan Seyfried schrieb:
Depends on how you define "big" and how many "all" means in number.

4 CPU packages, and 16 DIMM slots, but that was some time ago.

Does certainly not qualify as "big" anymore ;-)

XEN also needs a long time to clean the memory on start and while I'm not
suggesting that XEN is doing everything in the best way, and I have no
idea of the current memory bandwidth, but assume 20GB/second and you'll
need at least one minute to clear memory.

Wow, you have a machine with 1.2 Terabytes RAM?

1024GB.
And for whatever reason, the "scrubbing all available RAM" routine of xen
does not get that 20GB/second, since even a small 144GB blade I rebooted
today spent over 35 seconds in that state.

Assuming a RAM module size of 16 GB (biggest I could find), this means
at least 75 RAM modules. Could you tell me which x86 board you're
talking about? I'm curious because even the Tyan S8232 showcased at
Cebit maxes out at 768 GB RAM.

HP server blades, probably something like a BL680c G7 or such, not sure
about the exact type.
You'll get to see pretty interesting kernel problems with hardware of that
size, but it's getting offtopic here since unfortunately nobody is going
to run FACTORY on those beasts ;-)
--
Stefan Seyfried

"Dispatch war rocket Ajax to bring back his body!"
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