Red Hat Bugzilla – Bug 139582
NFS client doesn't push aio requests aggressively
Last modified: 2007-11-30 17:07:05 EST
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Description of problem:
When using aio with NFS files, performance is terrible, or the
application never completes. The problem is because the NFS client
doesn't push out reads or writes after they are queued by aio.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. See 137830 and use OraSim
Actual Results: OraSim reports "FATAL: Async I/O queue still jammed
after 10000 milliseconds" or other errors that suggests I/O is not
Expected Results: OraSim should run with performance as good as or
better than with normal I/O, without error.
nfs_kvec_read and nfs_kvec_write should flush queued read and write
requests after generic_file_kvec_* returns.
Created attachment 106843 [details]
NFS client now pushes queued aio requests immediately
For your review and comment
This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
For more information of the RHEL errata support policy, please visit:
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.