Re: Bad performance of 7.0 nfs client with Solaris nfs server

>  Just now got a chance to look at the trace.  It looks
like FILE_SYNC is
>  enabled on the write, which will cause the filer to
fully commit the
>  block (8k in this case) to disk before replying.  This
will usually hurt
>  performance.  I'm not certain where it is getting set,
but you might try
>  some mount options, like 'async' mode.  This might
also be a bug in
>  FreeBSD that is forcing it to be enabled all the time.
 I'll look
>  through some source code and see what I can find.
>
>  Eric
>
>

Hi

I have yes solved this issue and I have another test.
Now the mount is sync (no async) and the iozone includes
the -D flag.
Now the write performance boosts from 3MB/s to 30MB/s.

---
rootbsd7:~ iozone -D -+q 1 -i 0 -i 1 -r 2048 -n 2048 -g
2G -Raceb
iozone.xls -f /mnt/nest.ifom-ieo-campus.it/iozone/file.tmp
	Iozone: Performance Test of File I/O
	        Version $Revision: 3.283 $
		Compiled for 32 bit mode.
		Build: freebsd

	Contributors:William Norcott, Don Capps, Isom Crawford,
Kirby Collins
	             Al Slater, Scott Rhine, Mike Wisner, Ken Goss
	             Steve Landherr, Branessto, Mark Kelly, Dr.
Alain CYR,
	             Randy Dunlap, Mark Montague, Dan Million,
	             Jean-Marc Zucconi, Jeff Blomberg, Benny
Halevy,
	             Erik Habbinga, Kris Strecker, Walter Wong.

	Run began: Mon Mar 17 11:06:28 2008

	Using msync(MS_ASYNC) on mmap files
	Delay 1 seconds between tests enabled.
	Record Size 2048 KB
	Using minimum file size of 2048 kilobytes.
	Using maximum file size of 2097152 kilobytes.
	Excel chart generation enabled
	Auto Mode
	Include close in write timing
	Include fsync in write timing
	Command line used: iozone -D -+q 1 -i 0 -i 1 -r 2048 -n
2048 -g 2G
-Raceb iozone.xls -f
/mnt/nest.ifom-ieo-campus.it/iozone/file.tmp
	Output is in Kbytes/sec
	Time Resolution = 0.000004 seconds.
	Processor cache size set to 1024 Kbytes.
	Processor cache line size set to 32 bytes.
	File stride size set to 17 * record size.
                                                           
random
random    bkwd  record  stride
              KB  reclen   write rewrite    read    reread  
 read
write    read rewrite    read
            2048    2048   49419   49755   629565   632905
            4096    2048    7713   47431   625536   616224
            8192    2048   28479   49564   630012   620276
           16384    2048   26492   49515   631681   621500
           32768    2048   13030   49572   631771   617552
           65536    2048   24907   37586^C
---

Notice that now we have using msync(MS_ASYNC) on mmap files
(not a kernel expert so not sure if it is related to our
problem).
Without the -D flag we get 3MB/s with iozone.
Thanks for you help!

Valerio Daelli
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>
>  I have yes solved this issue and I have another test.

^^^ I haven't yet solved this issue

Sorry.

>  Now the mount is sync (no async) and the iozone
includes
>  the -D flag.
>  Now the write performance boosts from 3MB/s to
30MB/s.
>
>  ---
>  rootbsd7:~ iozone -D -+q 1 -i 0 -i 1 -r 2048 -n 2048 -g
2G -Raceb
>  iozone.xls -f
/mnt/nest.ifom-ieo-campus.it/iozone/file.tmp
>
>         Iozone: Performance Test of File I/O
>                 Version $Revision: 3.283 $
>                 Compiled for 32 bit mode.
>                 Build: freebsd
>
>         Contributors:William Norcott, Don Capps, Isom
Crawford, Kirby Collins
>                      Al Slater, Scott Rhine, Mike
Wisner, Ken Goss
>                      Steve Landherr, Branessto, Mark
Kelly, Dr. Alain CYR,
>                      Randy Dunlap, Mark Montague, Dan
Million,
>                      Jean-Marc Zucconi, Jeff Blomberg,
Benny Halevy,
>                      Erik Habbinga, Kris Strecker,
Walter Wong.
>
>         Run began: Mon Mar 17 11:06:28 2008
>
>         Using msync(MS_ASYNC) on mmap files
>
>         Delay 1 seconds between tests enabled.
>         Record Size 2048 KB
>
>         Using minimum file size of 2048 kilobytes.
>         Using maximum file size of 2097152 kilobytes.
>
>         Excel chart generation enabled
>         Auto Mode
>         Include close in write timing
>         Include fsync in write timing
>         Command line used: iozone -D -+q 1 -i 0 -i 1 -r
2048 -n 2048 -g 2G
>  -Raceb iozone.xls -f
/mnt/nest.ifom-ieo-campus.it/iozone/file.tmp
>
>         Output is in Kbytes/sec
>         Time Resolution = 0.000004 seconds.
>
>         Processor cache size set to 1024 Kbytes.
>         Processor cache line size set to 32 bytes.
>
>         File stride size set to 17 * record size.
>                                                        
    random
>  random    bkwd  record  stride
>               KB  reclen   write rewrite    read   
reread    read
>  write    read rewrite    read
>             2048    2048   49419   49755   629565  
632905
>             4096    2048    7713   47431   625536  
616224
>             8192    2048   28479   49564   630012  
620276
>            16384    2048   26492   49515   631681  
621500
>            32768    2048   13030   49572   631771  
617552
>            65536    2048   24907   37586^C
>  ---
>
>  Notice that now we have using msync(MS_ASYNC) on mmap
files
>  (not a kernel expert so not sure if it is related to
our problem).
>  Without the -D flag we get 3MB/s with iozone.
>  Thanks for you help!
>
>  Valerio Daelli
>
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