Initial NFS Test: Linux vs FreeBSD (769% slower)

[Rick Macklem]

Marc G. Fournier wrote:
> As an appendum … I found this post
> http://osdir.com/ml/freebsd-fs/2012-10/msg00156.html that talked about
> mounting with the oldnfs option, so tried that out … same speed …
> 
> 
> On 2013-04-26, at 09:19 , Marc G. Fournier <scrappy at hub.org> wrote:
> 
> >
> > Okay, I just bit the bullet and installed a Linux/Centos 6.4 system
> > for testing purposes.
> >
> > All hardware is *identical*, except that the FreeBSD server has the
> > nicer Intel card in it … the Linux is just using the onboard
> > Broadcom. Everything else is the same … same CPUs, same amount of
> > memory, same switch, same netapp … the netapp only has one filer
> > head, so its the same head. I created two separate volumes, but both
> > are on the same aggregate and the same size.
> >
> > OSs:
> >
> > FreeBSD 9.1-STABLE #2: Thu Apr 25 18:18:18 UTC 2013
> > 	- custom kernel, I try to compile everything I need in, what I
> > 	missed:
> >
> > vs
> >
> > Linux server03.openstudent.ca 2.6.32-358.6.1.el6.x86_64 #1 SMP Tue
> > Apr 23 19:29:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> > 	- CentOS 6.4 + 'yum update'
> >
> >
> > Everything is on the local drive *except* that I put
> > /usr/local/jboss on the NFS drive, and there is no virtualization
> > happening anywhere … everything is on the base server OS, and
> > nothing else is running on either of the machines.
> >
> >
> > FreeBSD start time for jBoss .. 270731ms (768% *slower*)
> > Linux start time for jBoss ….…. 35218 ms
> >
One thing is that, if you write an executable file to a Linux NFS
mount point and then run it, without unmounting/remounting, I don't
think it will page it in (the write will cache the pages).

If you didn't unmount/remount between writing jboss to the server and
timing the startup of it, please try it again after doing a dismount/mount.
(Doing the dismount/mount on the Linux client resulted in the same # of
 reads as FreeBSD for a quick test I did, instead of none without the
 dismount/remount.)

A few other things to do:
- Time multiple startups after doing a mount, to see if it only the
  first one that is slow.
- Capture the RPC counts for both clients by doing "nfsstat -c" before
  and after the startup.

If the above doesn't give you any good hints w.r.t. why it is slow,
you can capture packets during the startup for both clients and look
at them in wireshark, to try and figure out what the difference between
the Linux and FreeBSD clients are for this case.

rick

> > Even hitting ctl-c after the test to stop the process is 2x faster:
> >
> > FreeBSD: 4207ms (169% slower)
> > Linux: 2486ms
> >
> > Note that both systems have an equal lack of tuning … I wouldn't
> > even know *where* to start tuning Linux …
> >
> > Here is nfsstat -m for the two systems … both using nfsv3, same
> > rsize/wsize values, all default out of the box ...
> >
> > FreeBSD:
> > 192.168.1.1:/vol/freebsd_jboss on /usr/local/jboss-as-7.1.1.Final
> > nfsv3,tcp,resvport,hard,cto,lockd,sec=sys,acdirmin=3,acdirmax=60,acregmin=5,acregmax=60,nametimeo=60,negnametimeo=60,rsize=65536,wsize=65536,readdirsize=32768,readahead=1,wcommitsize=5175966,timeout=120,retrans=2
> >
> > Linux:
> > /usr/local/jboss-as-7.1.1.Final from 192.168.1.1:/vol/linux_jboss
> > Flags:
> > rw,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.1,mountvers=3,mountport=4046,mountproto=udp,local_lock=none,addr=192.168.1.1
> >
> >
> > Note, I have time on my side here … we are doing a limit pilot over
> > the next month, but it isn't until Sep/Oct that this project goes
> > live … what can we do to narrow down that gap?
> >
> > Thx
> >
> >
> >
> >
> >
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> 
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