[lkml]   [2002]   [Feb]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: ioremap()/PCI sickness in 2.4.18-rc2 (FIXED ALMOST)
> Sigh .... I am only using 2 GB on a 4GB capable processor (actually 
> a 64 GB capable processor). Looks like a patch is needed. Who is
> maintaining vmalloc.c at present so I know who to submit a patch
> to?

Actually you are using a 64Gb capable processor that is only capable of
sanely addressing 4Gb at a time, total across both user and kernel space
and takes a hefty hit whenever you switch which 4Gb you are peering at.

If you want to make sensible use of even 4Gb user/4Gb kernel you need to
take a page table reload at syscall time and deal with quite messy handling
for copy to/from user.

[If someone from Intel disagrees please do so publically - I'd love to have
someone prove the limit can be dealt with 8)]
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:24    [W:0.053 / U:1.352 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site