[Bugs] [Bug 1309462] Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance. Fresh install of 3.7.8 also has low write performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1309462



--- Comment #3 from Oleksandr Natalenko <oleksandr at natalenko.name> ---
Testing environment: 3.7.6 server, 3.7.6 client, 3.7.8 client.
Benchmark: dd if=/dev/zero of=bwtest bs=1M count=64

=== replica 2, performance.write-behind on, storage.linux-aio off ===

3.7.6 client: 56.5 MB/s
3.7.8 client: 54.4 MB/s

=== replica 2, performance.write-behind on, storage.linux-aio on ===

3.7.6 client: 57.3 MB/s
3.7.8 client: 6.7 MB/s

=== replica 2, performance.write-behind off, storage.linux-aio on ===

3.7.6 client: 27.1 MB/s
3.7.8 client: 27.5 MB/s

=== replica 2, performance.write-behind off, storage.linux-aio off ===

3.7.6 client: 40.3 MB/s
3.7.8 client: 41.5 MB/s

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