lkml.org 
[lkml]   [2009]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/8] git pull request for tip/tracing/core
Luck, Tony wrote:
>>> Before we go and make the change, Peter brought up a good point on IRC. Is
>>> there any reason that ia64 needs 1 << 14 IRQs? That's 16384!
>>>
>>> Perhaps the better solution wolud be (if possible), to simply lower the
>>> number of bits.
>> i'm the wrong person to be asked about that. (Cc:-ed the right people)
>
> People build some pretty big systems on ia64. SGI's largest has 4096
> cpus ... so 16384 IRQs is only 4 per cpu. That doesn't sound like very
> many to me.
>
> Fujitsu added the vector domain support for ia64 to get around the shortage
> of IRQs for large machines. Added them to the Cc: list to see if they have
> comments on how many IRQs are needed.
>

The 1024 IRQs are enough for GSIs on our maximum configuration. But
if the devices are MSI/MSI-X capable, it could be more than 1024.

Thanks,
Kenji Kaneshige




\
 
 \ /
  Last update: 2009-02-12 03:43    [from the cache]
©2003-2011 Jasper Spaans