Unstable output of FFSB (Filesystem benchmark)


 
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Old 06-23-2016
Unstable output of FFSB (Filesystem benchmark)

I'm trying to benchmark a RAID-6 server using FFSB and the result is really unstable to detect the pattern.

Scenario -1:

Block-size - 65536 (64KB)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off


Read throughput - 420MB/s (This is expected)


Scenario - 2:

Block-size - 65537 (64KB + 1 Byte)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off

Read throughput - 30GB/s (this is not)


Can anyone explain this behaviour?
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LATENCY(1)							      Xenomai								LATENCY(1)

NAME
latency - Xenomai timer latency benchmark SYNOPSIS
latency [options] DESCRIPTION
latency is part of the Xenomai test suite. It is a timer latency benchmark program. The system must run a suitable Xenomai enabled kernel with the respective module (xeno_timerbench). OPTIONS
latency accepts the following options: -h print histograms of min, avg, max latencies -s print statistics of min, avg, max latencies -H <histogram-size> default = 200, increase if your last bucket is full -B <bucket-size> default = 1000ns, decrease for more resolution -p <period_us> sampling period -l <data-lines per header> default=21, 0 to supress headers -T <test_duration_seconds> default=0, so ^C to end -q supresses RTD, RTH lines if -T is used -D <testing_device_no> number of testing device, default=0 -t <test_mode> 0=user task (default), 1=kernel task, 2=timer IRQ -f freeze trace for each new max latency -c <cpu> pin measuring task down to given CPU -P <priority> task priority (test mode 0 and 1 only) AUTHOR
latency was written by Philippe Gerum <rpm@xenomai.org>. This man page was written by Roland Stigge <stigge@antcom.de>. 2.6.0 2008-04-19 LATENCY(1)