Bug 865305
| Summary: | fuse: backport scatter-gather direct IO [rhel-6.3.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | RHEL Program Management <pm-rhel> |
| Component: | kernel | Assignee: | Frantisek Hrbata <fhrbata> |
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | high | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 6.4 | CC: | bdonahue, bengland, bfoster, dhoward, esandeen, jpallich, jshao, kzhang, msvoboda, perfbz, pm-eus, rwheeler, sforsber, shaines, vbellur |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.32-279.22.1.el6 | Doc Type: | Bug Fix |
| Doc Text: |
Filesystem in Userspace (FUSE) did not implement scatter-gather direct I/O optimally. Consequently, the kernel had to process an extensive number of FUSE requests, which had a negative impact on system performance. This update applies a set of patches which improves internal request management for other features, such as readahead. FUSE direct I/O overhead has been significantly reduced to minimize negative effects on system performance.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-02-05 19:56:12 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: | 858850 | ||
| Bug Blocks: | |||
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Description
RHEL Program Management
2012-10-11 08:00:26 UTC
Monson, see comment in https://bugzilla.redhat.com/show_bug.cgi?id=858850#c18 which describes how to get the test program and data. I didn't realize you had a separate bz for this. I think I can test the kernel for you now that I know where to find it. You can too if you have 10-GbE and some storage with throughput similar to 10-GbE. We really want this patch because it makes a huge difference, see the article at http://perf1.perf.lab.eng.bos.redhat.com/bengland/laptop/matte/virt/rhev-rhs-brief/rhev-rhs-single-host-perfbrief-v1.0.odt Best Regards, -ben so which rhel6.4 kernel should I test with? We'll try the RHEL6.3 kernel ASAP. I pulled RPMs in #c9 from Brew. (In reply to comment #10) > so which rhel6.4 kernel should I test with? We'll try the RHEL6.3 kernel > ASAP. I pulled RPMs in #c9 from Brew. The rhel6.4 kernel has been tested in Bug 858850 . So what you only need to do is pasting rhel6.3 kernel test result here, and I will do the rest. Thanks. I retested with above kernel 2.6.32-279.22.1.el6.x86_64 and 2.6.32-279.el6.x86_64 (RHEL6.3) and again I see a huge increase in throughput particularly with iozone reads from 1 or more guests inside the KVM host. Data and graphs are at: http://perf1.perf.lab.eng.bos.redhat.com/bengland/public/rhs/virt/sg-patch-retest-2013-01-21.ods Let me know when this patch can be obtained via RHN updates to RHEL6.3. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2013-0223.html |