There's dtrace on Mac.

On 11/28/10, Jan Stary <hans@stare.cz> wrote:
quoted text
> On Nov 28 00:19:42, Jason LaRiviere wrote:
>> Hello all,
>>
>> Recently, my lazy ass went from 4.6-current snap to the most recent
>> 4.8-current snap (#647: Fri Nov 26, amd64). Machine in question is
>> mostly a local file server, NFS to a few Macs. I say mostly, 'cause it
>> does some other stuff, and sits in a DMZ.
>>
>> Since the upgrade to 4.8, I'm unable to read /some/ files from the nfs
>> server to the macs. I say some, because in testing I've been able to
>> ascertain the following:
>>
>> 1. I can write any size file from the mac to the nfs server. No issue.
>> 2. I can write a small file (like 5 KiB), and read it back to the Mac.
>> 3. I can write a large file (like 700 MiB), and cannot read it back to
>> the Mac.
>> 4. I am unable to read any previously existing files on the NFS share to
>> the Mac, whether they be large, or small.
>>
>> Because the machine is in a DMZ, I made sure to disable the
>> DMZ->Internal filtering rules and stuff to rule out any stupidity.
>> Traffic dumps show no blocked packets.
>>
>> While grasping at straws, I set vfs.nfs.iothreads=4. The
>> Mac is mounting the share as -o resvport,hard,intr,nolock.
>>
>> The troubleshooting results thus far are just erratic enough to have me
>> believe it's nothing I've done; nothing is making sense. I'm basically
>> looking for corroboration here. Can anyone else replicate this?
>
> I am experiencing something similar on 4.8-current (server) and MacOSX
> 10.5.8 (client). I suspect the MacOSX to be the quilty one, as no other
> NFS client shows any of these symptoms.
>
> From the mac, I can write a file to the (auto)mounted share (/media)
> and read it back, but I cannot read any of the files that existed there
> before I mounted. A simple 'cat /media/.../file.txt' results in nothing
> (the command is still running); after a while, a window pops up saying
> 'Server connection interrupted: media [Disconnect]'. I can _list_ the
> content of the mounted share though.
>
> I am (auto)mounting it with -resvport,noauto,nodev,noexec,noatime.
> No filtering is done in between the boxes; they are on the same LAN,
> pf is not running. I need to look at what exactly the mac firewall is
> doing I guess.
>
> 	Jan