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Posted to dev@trafficserver.apache.org by "John Plevyak (JIRA)" <ji...@apache.org> on 2009/12/15 17:56:18 UTC
[jira] Created: (TS-86) HTTP cache miss latency huge
HTTP cache miss latency huge
----------------------------
Key: TS-86
URL: https://issues.apache.org/jira/browse/TS-86
Project: Traffic Server
Issue Type: Improvement
Components: Core
Reporter: John Plevyak
Single client back to back cache misses have an average latency of 50+ msecs. Cache hits (in ramcache) are substantially sub msec.
The problem seems to be with scheduling of events. My feeling is that this would be best addressed by reexamining the event/net subsystems
and possibly accelerating a move to libev which portabiliy supports waking threads waiting on I/O for cross-thread events.
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[jira] Closed: (TS-86) HTTP cache miss latency huge
Posted by "John Plevyak (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-86?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
John Plevyak closed TS-86.
--------------------------
Resolution: Fixed
Fix Version/s: 2.1.0
Committed revision 898919, dev branch
> HTTP cache miss latency huge
> ----------------------------
>
> Key: TS-86
> URL: https://issues.apache.org/jira/browse/TS-86
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: John Plevyak
> Assignee: John Plevyak
> Fix For: 2.1.0
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Single client back to back cache misses have an average latency of 50+ msecs. Cache hits (in ramcache) are substantially sub msec.
> The problem seems to be with scheduling of events. My feeling is that this would be best addressed by reexamining the event/net subsystems
> and possibly accelerating a move to libev which portabiliy supports waking threads waiting on I/O for cross-thread events.
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You can reply to this email to add a comment to the issue online.
[jira] Commented: (TS-86) HTTP cache miss latency huge
Posted by "John Plevyak (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-86?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792521#action_12792521 ]
John Plevyak commented on TS-86:
--------------------------------
Interestingly the problem still exhibits itself in optimized builds, not debug builds.
More investigation is required.
> HTTP cache miss latency huge
> ----------------------------
>
> Key: TS-86
> URL: https://issues.apache.org/jira/browse/TS-86
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: John Plevyak
> Assignee: John Plevyak
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Single client back to back cache misses have an average latency of 50+ msecs. Cache hits (in ramcache) are substantially sub msec.
> The problem seems to be with scheduling of events. My feeling is that this would be best addressed by reexamining the event/net subsystems
> and possibly accelerating a move to libev which portabiliy supports waking threads waiting on I/O for cross-thread events.
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You can reply to this email to add a comment to the issue online.
[jira] Assigned: (TS-86) HTTP cache miss latency huge
Posted by "John Plevyak (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-86?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
John Plevyak reassigned TS-86:
------------------------------
Assignee: John Plevyak
> HTTP cache miss latency huge
> ----------------------------
>
> Key: TS-86
> URL: https://issues.apache.org/jira/browse/TS-86
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: John Plevyak
> Assignee: John Plevyak
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Single client back to back cache misses have an average latency of 50+ msecs. Cache hits (in ramcache) are substantially sub msec.
> The problem seems to be with scheduling of events. My feeling is that this would be best addressed by reexamining the event/net subsystems
> and possibly accelerating a move to libev which portabiliy supports waking threads waiting on I/O for cross-thread events.
--
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You can reply to this email to add a comment to the issue online.
[jira] Commented: (TS-86) HTTP cache miss latency huge
Posted by "John Plevyak (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-86?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791677#action_12791677 ]
John Plevyak commented on TS-86:
--------------------------------
This issue is fixed in the latest cache patch available at git://jplevyak.homeip.net/trafficserver.
> HTTP cache miss latency huge
> ----------------------------
>
> Key: TS-86
> URL: https://issues.apache.org/jira/browse/TS-86
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: John Plevyak
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Single client back to back cache misses have an average latency of 50+ msecs. Cache hits (in ramcache) are substantially sub msec.
> The problem seems to be with scheduling of events. My feeling is that this would be best addressed by reexamining the event/net subsystems
> and possibly accelerating a move to libev which portabiliy supports waking threads waiting on I/O for cross-thread events.
--
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You can reply to this email to add a comment to the issue online.