[TS-3753] High CPU iowait with null-transform on a content from the cache.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 5.3.0
• Fix Version/s: sometime
• Component/s: Plugins, TS API
• Assignee: Unassigned
• Reporter: Pavel Vazharov
• Created: 10/Jul/15 07:06
• Updated: 16/Dec/15 17:32

Description

Hi,

I'm trying to calculate some stats doing null-transform on a content served from the cache. However, I observed high CPU iowait when doing this. I isolated the issue to be related to the case when we do transformation on a content served from the cache. Please, see the attached few lines patch which when applied to the null-transform plugin causes high CPU iowait. Note also that when I tried the original null-transform plugin I didn't observe such increased CPU iowait. Please, see also the attached picture where you can see the increased CPU iowait (between 15:30 and 16:30 in red) when I started the test with null-transform from cache.

Issue Links

• is duplicated by: TS-2496 Null transform plugin set 50% bandwidth capcability