Fedora14: Very very slow NFS write performance

[Terry Barnaby]

On 09/25/2011 06:41 PM, JB wrote:
> Terry Barnaby<terry1<at>  beam.ltd.uk>  writes:
>
>> ...
>> # Test1, defaults: nfs version 4, sync
>> Server /etc/exports:	"/data *.kingnet(rw)"
>> Client /etc/fstab:	"king.kingnet:/data /data nfs defaults 0 0"
>>
>> dd if=/tmp/data.bin of=/data/tmp/data.bin bs=102400
>> 32.9 MB/s
>>
>> dd if=/data/tmp/data.bin of=/tmp/data1.bin bs=102400
>> 66.5 MB/s<+++++++++++++++++++++++++++++++++++++++++++++++++++
>>
>> time tar -xf /tmp/jpgraph-3.5.0b1.tar
>> real    9m35.235s<===========================================
>>
>> time cp -a /tmp/jpgraph-3.5.0b1 /data/tmp
>> real    6m6.373s
>>
>> # Test4, nfs version 3, sync
>> Server /etc/exports:	"/data *.kingnet(rw,async)"
>> Client /etc/fstab:	"king.kingnet:/data /data nfs defaults,nfsvers=3 0 0"
>>
>> dd if=/tmp/data.bin of=/data/tmp/data.bin bs=102400
>> 34.6 MB/s
>>
>> dd if=/data/tmp/data.bin of=/tmp/data1.bin bs=102400
>> 120 MB/s<+++++++++++++++++++++++++++++++++++++++++++++++++++
>>
>> time tar -xf /tmp/jpgraph-3.5.0b1.tar
>> real    4m20.355s<===========================================
>>
>> time cp -a /tmp/jpgraph-3.5.0b1 /data/tmp
>> real    6m8.394s
>> ...
>
> The results marked (<===,<+++) show a regression for NFS v4 vice NFS v3,
> a decline of 100% for each test case.
> I think you should let them know (BZ report) - the type of test performed
> would be of interest to them.
>
> I would suggest this as well:
> to test by eliminating a possible problem with network, you could perform NFS
> tests (as above) locally (on your client machine in question), that is,
> install NFS server and client software locally, export some dir locally, and
> mount the exported dir locally.
> That is, you would mostly test the NFS software only.
>
> JB
>
>
I don't think it is a network issue. iperf shows this as Ok as do the NFS tests 
with async set.
Anyway a test with local nfs:
time tar -xf /tmp/jpgraph-3.5.0b1.tar
real    3m27.320s

The local disk access speeds in both systems are fine.
time (tar -xf /tmp/jpgraph-3.5.0b1.tar; sync)
real    0m2.816s

Cheers


Terry