Cst jack check for extended apic #210
Conversation
A customer saw vector space exhaustion, which meant NVMEs became unusable. This was caused by x2apic not being available, (which can itself by caused by IOMMU being disabled) Therefore, check that x2apic (Intel) or ext_apic (AMD) is available, which should result in plenty of IRQ space. https://weka-support.slack.com/archives/C066DNGSAE5/p1764947984669029
| #check that extended APIC (or x2apic) is available, because it's required for more | ||
| # space for IRQs | ||
|
|
||
| if (grep -m1 -q -E '^flags.*(\<extapic|\<x2apic)' /proc/cpuinfo) ; then |
There was a problem hiding this comment.
This errors out for me, unless there's a no-op instruction:
if (grep -m1 -q -E '^flags.*(\<extapic|\<x2apic)' /proc/cpuinfo) ; then
:
else
Also, do you intend for this to run in a subshell?
There was a problem hiding this comment.
Sorry @vrragosta no idea which version made it into the commit. Pushed a slightly less weird version.
| echo "by a Weka process." | ||
| echo "This can be caused by the presence of an enabled APIC device. Review your hardware," | ||
| echo "firmware, and linux kernel settings if this is causing a problem" | ||
| echo "This can sometimes prevent a WEKA Process from receiving interrupts from the NVME" |
There was a problem hiding this comment.
Weka doesnt care about the interrupts, the issue was that the kernel couldn't allocate interrupts and that caused the KERNEL to fail to use the device, which in turn made weka unable to use it since the device couldn't be scanned to know that it is a weka signed device.
| #check that extended APIC (or x2apic) is available, because it's required for more | ||
| # space for IRQs | ||
|
|
||
| grep -m1 -q -E '^flags.*(\<extapic|\<x2apic)' /proc/cpuinfo 2>/dev/null |
There was a problem hiding this comment.
Do we know for certain that all relevant platforms have x2apic? down to the oldest supported server platforms?
I never took notice of that to know myself.
There was a problem hiding this comment.
Apparently came out in 2008 with Nehalem.... I think that's older than weka.
No description provided.