[Scst-devel] [Q] benchmark best practice about SRP.

[Hiroyuki S. <hir...@gm...>]

Dear memebers.

I'm newbie about benchmarking.

I would like to know benchmark best practice about SRP.

I tested the following environment .

  result
  (this result is the average rate of multiple tests)

  1) enable buffer cache
    read  456MB/sec
    write 243MB/sec

  2) diable buffer cache
      read 454MB/sec
      write 246MB/sec

I'm thinking SRP is more faster and my test is something wrong.

I would like to know the following info.
I'll test again and feedback it.

  1) benchmark tool (only freeware)
  2) scst and kernel tuning parameters.
  3) observation point
    cpu average, memory usage... like that
  4) best practice website or books.

Thank you for your advice.

--
Hiroyuki Sato

-------------------------------------------------------------------------------

How to test

1, client and server environment

 SRP Server -- Mellanox SDR IB Card -- SRP Client

 Software
   OS : CentOS 5.5 x86_64
   IB Stack: OFED-1.5.3-rc3
   Kernel: 2.6.36.3 with scst_exec_req_fifo-2.6.36.patch patch
   SCST: 2.0.0.x (I downloaded it at 8/Feb)
     Tag                                       Revision
     1.0.0                                     439
     SRPT 1.0.0                                450
     1.0.1                                     805
     1.0.1.1                                   1050

  Server:
    memory 16GB (2GB * 8)				
    connected mode
    MTU 65520

  Client:
    512MB memory
    connected mode
    MTU 65520

2, Configuration

  Server:/etc/scst.conf

     HANDLER dev_disk {
       DEVICE 1:0:0:0
     }

     HANDLER vdisk_fileio {
       DEVICE disk01 {
         t10_dev_id "disk01 b8ceed65"
         usn b8ceed65
         filename /dev/ram0
       }
     }

     TARGET_DRIVER ib_srpt {
       TARGET ib_srpt_target_0 {
         LUN 0 1:0:0:0
         LUN 1 disk01
         enabled 1
       }
     }

     LUN1 is ramdisk 15GB allocated on server with grub.conf
          http://www.vanemery.com/Linux/Ramdisk/ramdisk.html

  client mounted LUN1

     ramdisk is formated as ext3.

     mount /dev/sdd1 /ramdisk ( no option )

3, benchmark

  tool: bonnie++-1.03e.tgz

  change bonnie.h value

  [before]
  define MinTime (0.5)

  [after]
  define MinTime (0.01)

  test command client# bonnie++ -s 13312 -d /ramdisk -s 13312 -u 70000:70000

  Sequential block read and write used.

4, disable buffer cache

  I wolud like to disable buffer cache. and I execute the fowlloing comand

  echo "0" > /proc/sys/vm/dirty_background_ratio
  echo "0" > /proc/sys/vm/dirty_ratio