Date: Sat, 16 Mar 2013 14:20:32 -0700 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: Tim Daneliuk <tundra@tundraware.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: NFS Performance: Weirder And Weirder Message-ID: <CAOgwaMuBY0Prye3DZFYUck3%2BGZeiJOFcCeF3%2Bi=JBqO2FQWb3g@mail.gmail.com> In-Reply-To: <5144BEB7.3090906@tundraware.com> References: <5144BEB7.3090906@tundraware.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Mar 16, 2013 at 11:49 AM, Tim Daneliuk <tundra@tundraware.com>wrote: > This is really weird. A FreeBSD 9.1 system mounts the following: > > /dev/ad4s1a 989M 625M 285M 69% / > devfs 1.0k 1.0k 0B 100% /dev > /dev/ad4s1d 7.8G 1G 6.1G 14% /var > /dev/ad4s1e 48G 9.4G 35G 21% /usr > /dev/ad4s1f 390G 127G 231G 35% /usr1 > /dev/ad6s1d 902G 710G 120G 86% /usr1/BKU > > /usr1/something (under ad4s1f) and /usr1/BKU (all of ad6s1d) are > exported for NFS mounting on the LAN. I have tested the > speeds of these two drives locally doing a 'dd if=/dev/zero ....'. > Their speeds are quite comparable - around 55-60 MB/s so the > problem below is not an artifact of a slow drive. > > The two mounts are imported like this on a Linux Mint 12 machine: > > > machine:/usr1/BKU /BKU nfs rw,soft,intr 0 0 > machine:/usr1/shared /shared nfs rw,soft,intr 0 0 > > Problem: > > When I write files from the LM12 machines to /BKU the writes are > 1/10 the speed of when writing to /shared. Reads are fine in both > cases, at near native disk speeds being reported. > > Someone here suggested I get rid of any symlinks in the mount and I did > that to no avail. > > > Incidentally, the only reason I just noticed this is that I upgraded the > NIC on the FreeBSD machine and the switch into which it connects to > 1000Base > because the LM12 machine had a built in 1000Base NIC. I also changed > the cables on both machines to ensure they were not the problem. Prior > to this, I was bandwidth constrained by the 100Base so I never saw NFS > performance as an issue. When I upgraded, I expected faster transfers > and when I didn't get them, I started this whole investigation. > > So ... I'm stumped: > > - It's not the drive or SATA ports because both drives show comparable > performance. > - It's not the cables because I can get great throughput on one of the NFS > mountpoints. > - It's neither NIC for the same reason. > > Does anyone: > > A) Have a clue what might be doing this > B) Have a suggestion how to track down the problem > > Thanks, > > -- > ------------------------------**------------------------------** > ---------------- > Tim Daneliuk tundra@tundraware.com > PGP Key: http://www.tundraware.com/PGP/ > > With respect to your mount points : /usr1 is spanning TWO different partitions : /dev/ad4s1f 390G 127G 231G 35% /usr1 /dev/ad6s1d 902G 710G 120G 86% /usr1/BKU because /usr1/BKU is a sub-directory of /usr1 . If you create a new directory , for example /usr2 , and /usr2/BKU , and using this new separate directory for sharing , such as : /dev/ad6s1d 902G 710G 120G 86% /usr2/BKU and machine:/usr2/BKU /BKU nfs rw,soft,intr 0 0 will it make difference ? Mehmet Erol Sanliturk
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAOgwaMuBY0Prye3DZFYUck3%2BGZeiJOFcCeF3%2Bi=JBqO2FQWb3g>