Pavel Vazharov created TS-3753:
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Summary: High CPU iowait with null-transform on a content from the
cache.
Key: TS-3753
URL: https://issues.apache.org/jira/browse/TS-3753
Project: Traffic Server
Issue Type: Bug
Components: Plugins, TS API
Reporter: Pavel Vazharov
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.
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