For clarity, here's how you can reproduce what I'm asking about:
This is for local file systems on build 86 and not about NFS or
any remote mounts. You can repeat these 100 times and always get
the same result, whether you reboot between trials or leave the
system running.
1. Log into the console of your OpenSolaris system.
2. Open a terminal in your home directory.
3. Create a file as in the command below and note the write
speed it returns. I know this method is not a true test of write
performance, but I'm interested in relative and not absolute numbers.
This method seems quite consistent in the results it returns.
dd if=/dev/zero of=outfile bs=1024 count=1000000
4. Enter a subdirectory of your home and do the same as above.
5. Log out of the console and perform the same tests via a remote
login using SSH or your favorite method. See that now there is no
difference in performance.
I've found the difference between steps 3 and 4 to be typically 25%.
This happens even with the most vanilla new install. On VirtualBox,
the differences can be more like 5x (i.e. 500%!).
Note that if you do step 5 when still logged into the console,
you get the same results as in step 3-4.
That's it. Maybe not hugely important, but I'm trying to understand
why this happens.
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