Bug 593369 - virtio-blk: Avoid zeroing every request structure
Summary: virtio-blk: Avoid zeroing every request structure
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.0
Hardware: All
OS: Linux
low
medium
Target Milestone: rc
: ---
Assignee: Jes Sorensen
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 598042
TreeView+ depends on / blocked
 
Reported: 2010-05-18 15:57 UTC by Jes Sorensen
Modified: 2010-09-13 05:46 UTC (History)
4 users (show)

Fixed In Version: qemu-kvm-0.12.1.2-2.55.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 598042 (view as bug list)
Environment:
Last Closed: 2010-06-11 02:44:27 UTC
Target Upstream Version:


Attachments (Terms of Use)
Avoid zeroing every request structure in virtio-blk (1.38 KB, patch)
2010-05-18 16:06 UTC, Jes Sorensen
no flags Details | Diff
54 vs 61 raw data (2.63 KB, application/x-gzip)
2010-06-10 08:46 UTC, Quan Wenli
no flags Details

Description Jes Sorensen 2010-05-18 15:57:04 UTC
Description of problem:
Avoid zeroing every request structure in virtio-blk.

This is a patch proposed for upstream by Stefan from IBM.

Version-Release number of selected component (if applicable):


How reproducible:

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Have run benchmarks seeing performance boost of 5-20% with this patch applied.

Patch not in upstream yet, but been acked by community. Believe it is very low risk to apply to RHEL6.

Comment 1 Jes Sorensen 2010-05-18 16:06:06 UTC
Created attachment 414901 [details]
Avoid zeroing every request structure in virtio-blk

Comment 2 RHEL Program Management 2010-05-18 16:15:45 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Comment 9 Quan Wenli 2010-06-10 08:46:31 UTC
Created attachment 422824 [details]
54 vs 61 raw data

Comment 10 Quan Wenli 2010-06-11 02:44:27 UTC
As comment #8 & #9 .I close it.


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