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Bug 593369 - virtio-blk: Avoid zeroing every request structure
Summary: virtio-blk: Avoid zeroing every request structure
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.0
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Jes Sorensen
QA Contact: Virtualization Bugs
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-
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 598042 (view as bug list)
Last Closed: 2010-06-11 02:44:27 UTC
Target Upstream Version:

Attachments (Terms of Use)
Avoid zeroing every request structure in virtio-blk (deleted)
2010-05-18 16:06 UTC, Jes Sorensen
no flags Details | Diff
54 vs 61 raw data (deleted)
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:
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 Product and 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

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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