[Bugs] [Bug 1673058] Network throughput usage increased x5

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1673058

Hubert <revirii at googlemail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |revirii at googlemail.com



--- Comment #6 from Hubert <revirii at googlemail.com> ---
We seem to have the same problem with a fresh install of glusterfs 5.3 on a
debian stretch. We migrated from an existing setup (version 4.1.6,
distribute-replicate) to a new setup (version 5.3, replicate), and traffic on
clients went up significantly, maybe causing massive iowait on the clients
during high-traffic times. Here are some munin graphs:

network traffic on high iowait client:
https://abload.de/img/client-eth1-traffic76j4i.jpg
network traffic on old servers: https://abload.de/img/oldservers-eth1nejzt.jpg
network traffic on new servers: https://abload.de/img/newservers-eth17ojkf.jpg

performance.readdir-ahead is on by default. I could deactivate it tomorrow
morning (07:00 CEST), and provide tcpdump data if necessary.


Regards,
Hubert

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