#29120: Default value of media.cache_size (0) causes some media to load
extremely
slowly or become unplayable
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Reporter: QZw2aBQoPyuEVXYVlBps | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by QZw2aBQoPyuEVXYVlBps):
I've narrowed down the criteria for when this bug happens. It will trigger
for any video played using the built in media player ({{{<video
src='...'>}}}) that's filesize is either greater than
{{{media.memory_cache_max_size}}} (default 8192kb) or unknown (no
{{{Content-Length}}}).
I've also established that setting {{{media.cache_size}}} to 0 does
''not'' eliminate writing the cache to disk, it simply limits the cache
file on disk to a few hundred kilobytes and constantly cycles it. Due to
the nature of how physical storage mediums work, this is likely to be
functionally equivalent to writing the entire cache to disk without all
the nonsense inbetween.
You can observe this yourself with the following command: {{{inotifywait
-me modify,create,delete,move -r /tmp/ | grep mozilla}}}
If you open the link in the first post in Tor Browser, you should start
seeing mozilla temporary files being written to, this is the disk-backed
MediaCache.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29120#comment:1>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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