Bug 71698
| Summary: | NFS client loses a lot of performance between RH 7.2 and 7.3 | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Tim Skirvin <tskirvin> |
| Component: | nfs-utils | Assignee: | Pete Zaitcev <zaitcev> |
| Status: | CLOSED RAWHIDE | QA Contact: | Ben Levenson <benl> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.3 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2002-08-16 19:29:19 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: | |||
We believe this problem is fixed in the 7.3 errata kernel which should be coming out within a week or so. |
Description of Problem: (from my post to comp.os.linux.redhat): The short version: why has NFS client support gotten so much worse between RH 7.2 and 7.3, and what can we do about it? Alright, some background: we're a mixed-platform Unix shop, with Solaris Sparc servers and a mix of primarily Linux and Solaris desktops (with a few of just about everything else for good measure - IRIX, Tru64, HP-UX, AIX, OS X, Win2k). The network is NFS/NIS using the automounter, and has worked quite well historically. While most of our Linux boxes are running RedHat 7.2, I've begun installing a few limited RH 7.3 test boxes in the group for testing purposes. So far, it's going great except for one thing: the NFS performance. If the systems attempt to copy any large files or perform any non-trivial NFS task, they get errors of the sort of: "nfs: task xxxx can't get a request slot" ...and the task doesn't really complete. Even when it does work, performance is terrible - copying a 256M file to local disk takes minutes instead of seconds on similar machines (10:35.43 on a RH 7.3 box, compared to 0:50.18 on 7.2). I have tried patching the 7.3 boxes to the most recent kernel RPM (2.4.18-5), which hasn't changed anything significantly. On searching Usenet, I've found word that I should be lowering the default wsize and rsize to 8k or 16k; I don't consider this an acceptable alternative, given that we use the automounter and any changes I make there will affect all other systems on our network. Otherwise, I'm stumped. And I'm really tempted to give RH 7.3 a miss, which seems a shame but apparently necessary. Version-Release number of selected component (if applicable): 7.3, kernels 2.4.18-3 and 2.4.18-5 (either) How Reproducible: Perfectly Steps to Reproduce: On two (similar but not identical) systems: # mount reno:/export/reno/ext36 /mnt # time cp /mnt/isoimages/valhalla-i386-disc1.iso /scratch RH 7.2 (2.4.9-34) results: 0.060u 16.580s 2:15.84 12.2% 0+0k 0+0io 103pf+0w RH 7.3 (2.4.18-5) results: 0.070u 62.730s 5:47.73 18.0% 0+0k 0+0io 100pf+0w