Software Tuning, Performance Optimization & Platform Monitoring
Discussion around monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform monitoring

can't access RAM from PCIe device in Xeon

rshal2
New Contributor II
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Hello,

Is there an known issue of access Xeon's RAM from PCIe (DMA access) ? We observe the issue when using linux 4.x on E5 servers ?
We have this issue only with Xeon E5 + Linux, and using other Intel's chip there is no issue.
When we use the same BIOS, Chip, with windows , we manage to access RAM's from PCIe (DMA access).

I've tried to search and asked the question, but got no response.
Is it a known issue in this chip ? Why is it observed with Linux , but not with Windows ?
Should I upgrade BIOS or is it some BIOS parameter that I should configure ?

We also tried to get assistance from Intel's and from Linux kernel, but nothing helped understanding this issue.
https://bugzilla.kernel.org/show_bug.cgi?id=205701

We are struggling with this issue for a long time now,

Any suggestion about this issue will help, 

Ran

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