Date: Fri, 31 Jan 2014 20:20:00 -0500 From: J David <j.david.lists@gmail.com> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-net@freebsd.org, Garrett Wollman <wollman@freebsd.org> Subject: Re: Terrible NFS performance under 9.2-RELEASE? Message-ID: <CABXB=RQDDn2AW0tU4hb9mS5hN5B52VFcCGiicv0SCkMB7SEKAg@mail.gmail.com> In-Reply-To: <1622306213.1079665.1391210205488.JavaMail.root@uoguelph.ca> References: <CABXB=RQ6LdeoNi4vNZGCaM2C_up_JCf2SpWPzm2S_M_%2BpTnzsQ@mail.gmail.com> <1622306213.1079665.1391210205488.JavaMail.root@uoguelph.ca>
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On Fri, Jan 31, 2014 at 6:16 PM, Rick Macklem <rmacklem@uoguelph.ca> wrote:
> You can certainly try "-o rsize=61440,wsize=61440" (assuming a 4K page size)
> for the mount, if you'd like.
This has previously been tested with all 4k steps between 16k and 32k.
All of them perform worse than
With 61440, NFS fails outright on the random read test:
$ iozone -e -I -s 1g -r 4k -i 0 -i 2
Iozone: Performance Test of File I/O
Version $Revision: 3.420 $
Compiled for 64 bit mode.
Build: freebsd
[...]
Include fsync in write timing
O_DIRECT feature enabled
File size set to 1048576 KB
Record Size 4 KB
Command line used: iozone -e -I -s 1g -r 4k -i 0 -i 2
Output is in Kbytes/sec
Time Resolution = 0.000005 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random
random bkwd record stride
KB reclen write rewrite read reread read
write read rewrite read fwrite frewrite fread freread
1048576 4 24688 23891
Error reading block at 1073729536
read: Bad file descriptor
Upon using the -w option, which leaves the file intact on exit, it's
possible to see that it's not even 1gig in length:
$ ls -aln iozone.tmp
-rw-r----- 1 1000 0 1073709056 Feb 1 01:18 iozone.tmp
It's 32k short, which is a pretty surprising result.
Thanks!
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