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From "George Paul (JIRA)" <>
Subject [jira] Commented: (TS-46) increase cache partition size to avoid write-aggregation seeks
Date Fri, 20 Nov 2009 16:32:40 GMT


George Paul commented on TS-46:

I have tested this patch for 3+hrs on ubuntu 8.04LTS x86_64 w/ 2 disks and I have not noticed
any issues in forward proxy mode. Preliminary indications indicate performance has improved
>50% with these changes with roughly same CPU utilization with logging off but more thorough
perf-testing is needed.

> increase cache partition size to avoid write-aggregation seeks
> --------------------------------------------------------------
>                 Key: TS-46
>                 URL:
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Cache
>         Environment: all
>            Reporter: John Plevyak
>         Attachments: ts-partition-size-jp-v1.patch
>   Original Estimate: 168h
>  Remaining Estimate: 168h
> Currently cache partitions are 8GB.  Because each has a write pointer, this means on
a decent size
> disk there are a hundred or more write pointers which means a lot of seeking for writes
> (which really should be aggregated).  The proposal is to make it possible to have large
> (up to .5 PB) by increasing the side of the cache directory entry from 8 to 10 bytes
and using the
> additional bits for the offset. 

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