[tor-bugs] #31425 [Circumvention/Snowflake]: Snowflake broker is sluggish and sometimes fails

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#31425: Snowflake broker is sluggish and sometimes fails
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 Reporter:  cohosh                   |          Owner:  (none)
     Type:  defect                   |         Status:  needs_information
 Priority:  Low                      |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  broker                   |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by cohosh):

 Replying to [comment:7 cypherpunks]:
 > now it takes a ton of time for snowflake to bootstrap since I constantly
 get `504 Gateway Timeout`s, and it takes a ton of time for tabs to load
 again when I need to pick a new snowflake while browsing. This again makes
 snowflake completely  unusable for me.

 Thanks for the update cypherpunks,

 To add to the information here, starting yesterday I've been getting
 notifications from sysmon that the snowflake broker becomes unreachable
 periodically (I received 3 notifications yesterday that unreachability
 lasted approximately 10-25 minutes.

 I also SSH'd into the broker today and it is very slow. Nothing in the
 metrics suggests an unusually high load of regular clients and proxies
 compared to last week when it was working just fine.
 Running top shows that there isn't a lot of CPU or memory usage. This
 leaves a data transfer or maybe I/O as possible causes for the slowdown.
 I'll set up some packet captures to see whether we're getting a large
 amount of traffic not represented in the metrics.

 Snowflake proxy metrics: https://snowflake-broker.bamsoftware.com/metrics

 Possibly related: #30498

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31425#comment:8>
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