Bug 88040
Summary: | "dmesg" reports 4 processors instead of 2. | ||
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Product: | [Retired] Red Hat Ready Certification Tests | Reporter: | Alex Matei <matei5> |
Component: | kernel | Assignee: | Rob Landry <rlandry> |
Status: | CLOSED NOTABUG | QA Contact: | Rob Landry <rlandry> |
Severity: | high | Docs Contact: | |
Priority: | high | ||
Version: | 1.8 | CC: | hcp-admin |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i686 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2003-04-04 21:08:45 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Alex Matei
2003-04-04 20:40:56 UTC
This is expected. XEON CPUs (meaning those with the marketing name XEON not the extention XEON eg. Pentium III XEON) have two processing units per physical unit. This means that for every CPU the Linux kernel counts two, so 2 CPUs * 2 units = 4. While it's not quite the same as a four CPU SMP system there are similarities; the limitation of this setup is that for every two cpu's you share the cache and other lines. Intel calls this technology Hyper-Threading. If you would like to verify that your CPUs contain the Hypter-Threading technology you can check the flags under /proc/cpuinfo where you see things like 'mmx' and 'sse2'; there should also be an 'ht' flag. |