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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bench(1)						      General Commands Manual							  bench(1)

NAME
bench - http benchmark SYNOPSIS
bench [-n requests] [-c concurrency] [-t timeout] [-k] [-K count] [-C cookie-file] [http://]host[:port]/uri DESCRIPTION
bench is a HTTP benchmark program that can fetch the same URL over and over again, or fetch several URLs (coming in from stdin). If you specify a URL on the command line, this URL will be fetch many times (specify with -n, default: 10000) with several connections open in parallen (specify with -c, default: 10). You can specify a timeout (per request) in seconds with -t. The -k switch activates keep-alive mode. In keep-alive mode, the TCP connection is not closed between requests. You also have to specify how many HTTP requests can go over one TCP connection with -K. bench can also send one HTTP cookie per connection, as specified using a cookie file. The cookie file is read line by line, and each request gets the next line inserted into it. So each line should look something like this: Cookie: foo=bar If the end of the file is reached, bench restarts it at the beginning. AUTHOR
Initially written by Felix von Leitner <felix-gatling@fefe.de>. LICENSE
GPLv2 (see http://www.gnu.org/copyleft/gpl.html) bench(1)