Greetings,
The following webrev contains performance fixes for client cache usage:
19130 non-existent caches can significantly degrade transport
performance
19131 repository class should assume v4+ format uses v1 file layout
19132 image class should assume v4+ format uses v1 file layout
https://cr.opensolaris.org/action/browse/pkg/swalker/pkg-cache-1/webrev/
These changes reduce the number of failed stat calls by about 66% during
a pkg update -nv on my system. When the cache is "cold", this can
significantly improve transfer performance (1MB/s -> 6MB/s).
These changes also fix a bug where every configured file repository was
checked for every single file downloaded multiple times. In my system's
case, one of the configured repositories is a file repository for which
I/O requests are very slow (think /nfs repo to a distant country), and
this change reduced the transfer time by at least 30 minutes. For some
users with an NFS-configured repository, this could reduce transfer
times by hours.
-Shawn
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