Occasionally, we get errors like these:
Jun 9 00:56:35 [kernel] [18020.416620] PCI-DMA: Out of IOMMU space
for 12288 bytes at device 0000:03:01.0
and it looks like it might have something to do with these messages
(after updating and setting BIOS as below):
Jun 15 16:38:54 [kernel] [ 0.000000] Checking aperture...
Jun 15 16:38:54 [kernel] [ 0.000000] CPU 0: aperture @ 0 size 256 MB
Jun 15 16:38:54 [kernel] [ 0.000000] No AGP bridge found
Jun 15 16:38:54 [kernel] [ 0.000000] Your BIOS doesn't leave a
aperture memory hole
Jun 15 16:38:54 [kernel] [ 0.000000] Please enable the IOMMU
option in the BIOS setup
Jun 15 16:38:54 [kernel] [ 0.000000] This costs you 64 MB of RAM
Jun 15 16:38:54 [kernel] [ 0.000000] Mapping aperture over 65536
KB of RAM @ 8000000
The box is a dual Opteron 250 with an Arima HDAMA Rev. D motherboard.
The updated BIOS options are (with * for current setting)
MTRR mapping method [Continuous, Discrete*]
Memhole mapping [Software, Hardware*]
4 GB memory hole adjust [Disabled, Manual, Auto*]
4 GB memory hole size [128 MB]
IOMMU [Disabled, Enabled*]
Size [multiple sizes, 256 MB*]
Initially, I was booting kernel 2.6.16.1 with iommu=merge, but the
above message still occur when I booted without any iommu kernel
parameters.
First, am I correct to assume that I'm not getting the 256 MB?
Second, is the the case the BIOS is lying?
Third, what could be a workaround to get enough memory for the PCI
card that causes the out of space error (3Ware 8506)?
--
Maurice Volaski, [email protected]
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
