Messages in this thread | | | Date | Thu, 15 Jun 2006 17:17:32 -0400 | From | Maurice Volaski <> | Subject | The "Out of IOMMU space" error and the "Please enable the IOMMU option" option |
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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, mvolaski@aecom.yu.edu 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 majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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