Re: [NFS] NFS performance debugging

[Olga Kornievskaia <aglo@citi.umich.edu>]

Krishna Kumar2 wrote:
> linux-nfs-owner@vger.kernel.org wrote on 06/25/2008 07:29:16 PM:
>
>   
>> But please do not let this caveat stop you from trying this script and
>> mountstats script. We definitely need feedback on how well they do or
>> don't work (and as always... patches are welcomed! ;-) ) Once things
>>     
> harden
>   
>> up (via any feedback), I'll added the install code to make these scripts
>>     
> be
>   
>> installed (probably in /usr/sbin) which means they will be ready for
>> prime time...
>>     
>
> Hi Steve,
>
> When I ran this util, it worked the first time:
>
> [root@localhost ~]# /tmp/nfs-iostat
>
> localhost:/local mounted on /nfs:
>
>    op/s         rpc bklog
>    1.27            0.01
> read:             ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.619          39.772          64.273        0 (0.0%)
> 16.889          16.927
> write:            ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.626          39.112          62.523        0 (0.0%)
> 26.357         4039.241
>
> 8.124.111.71:/mnt mounted on /mnt:
>
>    op/s         rpc bklog
>    3.00            0.00
> read:             ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
> write:            ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
>
> (KK: for some reason, the real NFS mount gives all zero. Also, for
> loopback, the read/write
> BW is very poor: less than 40 Kb/s).
>
> But from the next time I ran, and all subsequent runs (and even after a
> reboot),
> I get:
>
> [root@localhost init.d]# /tmp/nfs-iostat
> localhost:/local mounted on /nfs:
>
>    op/s         rpc bklog
>    0.04            0.00
> read:             ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
> write:            ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
>
> 8.124.111.71:/mnt mounted on /mnt:
>
>    op/s         rpc bklog
>    6.00            0.00
> read:             ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
> write:            ops/s            Kb/s           Kb/op         retrans
> avg RTT (ms)    avg exe (ms)
>                   0.000           0.000           0.000        0 (0.0%)
> 0.000           0.000
>
> (KK: every filesystem gives zero for all parameters).
>
> What could be wrong?
>   
Are you running nfs-iostat just once? While doing your testing, you 
should do "nfs-iostat 2" so that every 2secs nfs-iostat displays 
information about the on-going test (you can choose any other polling 
interval value).
> Thanks,
>
> - KK
>
>
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