[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-ext4
Subject:    Barriers per second while doing Odirect Random Writes
From:       Keith Mannthey <kmannth () us ! ibm ! com>
Date:       2010-04-26 7:06:17
Message-ID: 1272265577.9664.57.camel () keith-laptop
[Download RAW message or body]

Ted and all, 
  While using this FFSB test profile:
http://btrfs.boxacle.net/repository/raid/2010-04-14_2004//ext4-2.6.34-rc3-nobarrier//b \
trfs1.ffsb.random_writes_odirect__threads_0128.10-04-21_17.38.39/benchmark/profile \
(The profile is 128 threads of all odirect random writes. ) on my raid box I am \
seeing (via Darricks block_barrier tracepoint) right about 32 barriers per second.

Initial analysis using perf shows kdmflush as the cause. I will continue
to look into this.  

Thanks,
  Keith Mannthey
  LTC FS-Dev 



--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[prev in list] [next in list] [prev in thread] [next in thread]