Bug 639790
| Summary: | Performance Tuning Guide: TRACKING BUG for [I/O] [Asynchronous I/O] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Don Domingo <ddomingo> |
| Component: | doc-Performance_Tuning_Guide | Assignee: | Laura Bailey <lbailey> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | ecs-bugs |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 6.1 | CC: | ddomingo, srao |
| Target Milestone: | rc | Keywords: | Documentation, Tracking |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | 6.1 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-07-04 01:51:48 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: | 639779 | ||
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Comment 9
Sanjay Rao
2011-02-14 17:42:47 UTC
I had these comments Please take out the line "This allows an application to perform I/O on multiple sources simultaneously. " from the first para. Synchronous IO also works on multiple sources. The IO wait is on a per device basis so if an IO is issued to a device, synchronous IO waits for that IO to complete before issuing another IO to the device. If you want you can change it to "This allows an application to issue multiple IOs to a device and continue with its operation" Your comment Sanjay: do we need to explain the sudden drop in delta from 60U to 80U? or am i reading the graph incorrectly? My response - The drop in the difference is because of user contention. It is common among database applications to see run to run variation of a couple of percent. If you look closely, the blue bar dropped a bit and the orange bar went up a bit so the delta dropped. We can either mention that or modify the graph to take out the 80 user run. thanks Sanjay, edited accordingly. please review: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/s-storage-asyncio.html i'll just leave the graph as-is. please advise if the section is good to go, and i will set it to MODIFIED. thanks! Looks good. Verified based on c#12 in Red_Hat_Enterprise_Linux-Performance_Tuning_Guide-6-en-US-1.0-28 |