Red Hat Bugzilla – Bug 272201
[Xen] vmalloc/vfree on HVM Guest/IA64 does untolerate performance.
Last modified: 2009-06-19 20:47:27 EDT
Description of problem:
Windows guest/IA64 have a bad network performance due to lack of
optimizations on ptc.e emulation and on vtlb size.
This issue is already fixed by part of following patch
changeset: [IA64] Speedup ptc.e emulation
changeset: [IA64] Make MMU setting of domVTi configurable
changeset: [IA64] Shrink vtlb size
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Test with ttcp(network benchmark)
execute ttcp -u -t -l65000 -n75000 xx.xx.xx.xx
patches VHPT size Throughput (KB/sec)
not applied 16M 47483.96
applied 2M(vti_vhpt_size=1024) 79691.03
Network Performance is worse.
Network Performance is fine.
Thank you for your escalating for 5.2.
As to z-stream, I'll clarify it again. I just requested because I saw the
following comment in their report.
> Fix Target: 5.1.
> errata Request: Yes
Actually, there is no explanation why they cannot wait 5.2. Though I
guess, they need to provide this fix for the customer having 5.1.z
subscription. Despite my guess, I'll have them explain the need.
This event sent from IssueTracker by mmatsuya
This is a feature, not a bug. Windows is not officially supported as a guest on
RHEL at this time.
Targeting 5.2 and will discuss other possible options with Brian Stein en
company. Currently, we have no mechanism to deliver a feature between minor updates.
PM ACK for 5.2
QE ack for RHEL5.2. Appears we have patches and reproducer mentioned in bug intro.
Can we get a comment from Development on whether this will be in RHEL5.2. We
already have PM and QA ACKs.
Per Jan Holzer,
> (2) When and where will the mentioned para-virtualized drivers become
> available (also for customers)? Will they be free of charge?
The goal is to deliver the para-virtualized drivers for RHEL (RHEL3/4/5) by the
end of this year (2007) , the Windows para-virtualized drivers are currently
targeted to be available in early 2008. The drivers are currently tested by a
number of customers and if you have customers interested in testing a beta
version of the (RHEL) drivers we'd be than happy to work with them and provide
Fujitsu, is this a problem with the new drivers? If so, this issue would be a
bug in a promised feature.
Setting needinfo for clarification on question in comment #6,
This issue is unrelated to drivers. Even if para-virtualized drivers is used,
the problem still remains. Thus we need these patches.
Patch was previously POSTED but needs to be reworked against 5.2, will be POSTED
Changing component to kernel-xen.
You can download this test kernel from http://people.redhat.com/dzickus/el5
kernel-xen-2.6.18-73.el5 is OK.
We confirmed the source code and the test passed.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.