Re: 2.4.20 TCP server + solaris client performance

[Eric Whiting <ewhiting@amis.com>]

Have you verified that your storage is properly setup? Is it IDE/SCSI/RAID? IDE
storage with DMA disabled will cause terrible performance. Please verify disk
speed on local writes and make sure they are 'faster' than the network. 

What version of SOlaris are you running? Solaris 8 and newer has a lot of NFS
fixes...

We are getting good NFS numbers with 2.4.20 UDP NFS servers against solaris [89]
clients.

eric





Fabrizio Nesti wrote:
> 
> Sorry,
> the reason to switch to TCP was exactly the same: poor nfs performance as
> seen from any solaris client. And by poor I mean three-five times slower.
> 
> The same "tar xf" (a typical high load r/w usage) gives
> 
>                      linux server           solaris server
> linux   client      1 sec (udp)(caching?)    8 sec (for both tcp and udp)
> solaris client      22/40 sec (tcp/udp)      10/8 sec (tcp/udp)
> 
> We worry about these ^^^  figures, since we bought a new linux server
> to switch to, and we have some solaris clients.
> 
> Since solaris nfs clients sseems to prefer TCP, and following some messages
> on the list, we tried that. (Even tuning can not improve this situation).
> Is there something wrong we are doing or we have to switch back to soalris
> server?
> 
> Thanks again,
> Fabrizio Nesti
> 
> On Mon, 17 Feb 2003, Alan Powell wrote:
> 
> > 8192 block size is a Linux daemon limitation. Also,
> > don't switch to TCP unless you need to. UDP will be
> > faster if you have a decent network. Revert back to
> > UDP, and on the client side, run "nfsstat -c" and
> > monitor the number of retransmissions. If that number
> > doesn't increase, you have a clean network, and you
> > should stay on UDP.
> >
> >
> > --- Fabrizio Nesti <nesti@medialab.sissa.it> wrote:
> > > Hello to everybody.
> > > we are reporting a very low performance for nfs
> > > access from Solaris clients
> > > to the linux nfs server on RH8.0. We thought it was
> > > udp and upgraded to
> > > kernel 2.4.20.
> > >
> > > Now the performance is still low, compared to a
> > > solaris server:
> > >     # time gtar xf /var/tmp/cvs-1.11.5.tar
> > >     Writing on Linux_2.4.20> real    0m22.132s
> > >     Writing on Solaris_8>    real    0m7.174s
> > >
> > > Both filesystems are mounted with
> > > proto=tcp,rsize=32768,wsize=32768.
> > > Snooping the traffic however, it appears that the
> > > linux server is not
> > > serving with size=32768, but with a maximum size of
> > > 8192.
> > >
> > > - Is there a reson for this?
> > > - May this be the reason for the poor performance
> > > above?
> > >
> > > Thanks in advance,
> > > Fabrizio Nesti
> > >
> > >
> > > PS: Some snoop traffic:
> > > ...
> > >   solaris -> linux  NFS C CREATE3 FH=884D
> > > (EXCLUSIVE) check_cvs.in
> > > linux -> solaris    NFS R CREATE3 OK FH=174A
> > >  solaris -> linux   NFS C SETATTR3 FH=174A
> > > linux -> solaris    NFS R SETATTR3 OK
> > >   solaris -> linux  NFS C WRITE3 FH=174A at 0 for
> > > 8192 (ASYNC)
> > >   solaris -> linux  TCP D=2049 S=793 Ack=633960980
> > > Seq=849797604 Len=1460
> > >   solaris -> linux  TCP D=2049 S=793 Ack=633960980
> > > Seq=849799064 Len=1460
> > >   solaris -> linux  TCP D=2049 S=793 Ack=633960980
> > > Seq=849800524 Len=1460
> > >   solaris -> linux  TCP D=2049 S=793 Ack=633960980
> > > Seq=849801984 Len=1460
> > >   solaris -> linux  TCP D=2049 S=793 Ack=633960980
> > > Seq=849803444 Len=1056
> > > linux -> solaris    TCP D=793 S=2049 Ack=849804500
> > > Seq=633960980 Len=0
> > > ...
> > >
> > >
> > >
> > >
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