Bug 167192
Summary: | NFSv3 locking misses important kernel patches | ||
---|---|---|---|
Product: | Red Hat Enterprise Linux 4 | Reporter: | Florian von Kurnatowski <florian> |
Component: | kernel | Assignee: | Steve Dickson <steved> |
Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | 4.0 | CC: | jbaron, jch, k.georgiou, link, lwang, s.davison |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i386 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | RHSA-2006-0132 | Doc Type: | Bug Fix |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2006-03-07 19:44:20 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: | |||
Bug Depends On: | |||
Bug Blocks: | 168429 |
Description
Florian von Kurnatowski
2005-08-31 14:32:05 UTC
In addition, while doing the testing on FC4, we're experiencing a throughput of 15-16MB/s. to the NetApp box as opposed to 5-6MB/s on RHEL4, all other parameters unchanged. On testing with FC4 and Kernel 2.6.11-1 there, we still saw lock-related lockups of processes under load. We weren't able to gather exact data, but working assumption is that the NFS locking code in 2.6.11 is not fully stable either. A preliminary test suggests that this is a regression from RHEL3. The "nolock" option seems to do what Florian requires -- it simply causes a fall-back to local-locking instead of NFS locking. Although the man page sort-of implies that "nolock" completely disables locking this would appear to be a completely useless option: it converts a slow locking mechanism for an exclusively mounted NFS directory (as from an NAS) into a something that is unusable! I've used "nolock" with RHEL3 to greatly speed up applications that do a lot of file locking -- and, of course, made sure that no one else is using NFS exported file system. There's still time to get this in RHEL4 U2 isn't there? It's quite important for people who want to use NetApp servers and the like. Its probably too late to get it into U2, but I will try and get it in as early as possible for U3 and if need be, you can request an Hot Fix kernel. *** Bug 170545 has been marked as a duplicate of this bug. *** 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. http://rhn.redhat.com/errata/RHSA-2006-0132.html |