Bug 593369

Summary: virtio-blk: Avoid zeroing every request structure
Product: Red Hat Enterprise Linux 6 Reporter: Jes Sorensen <Jes.Sorensen>
Component: qemu-kvmAssignee: Jes Sorensen <Jes.Sorensen>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: low    
Version: 6.0CC: llim, szhou, virt-maint, wquan
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-0.12.1.2-2.55.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 598042 (view as bug list) Environment:
Last Closed: 2010-06-11 02:44:27 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: 598042    
Attachments:
Description Flags
Avoid zeroing every request structure in virtio-blk
none
54 vs 61 raw data none

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.