Justin Piszcz wrote:
Someone should write a document with XFS and barrier support, if I
I would expect you, as an experienced tester, to have done this
measurement more rigorously!
in the past, they never worked right on raid1 or raid5 devices, but it
appears now they they work on RAID1, which slows down performance ~12
I don't think it means much if this is what you did.
l1:~# /usr/bin/time tar xf linux-18.104.22.168.tar 0.15user 1.54system
0:13.18elapsed 12%CPU (0avgtext+0avgdata 0maxresident)k
Before doing any disk test you need to start by dropping cache, to be
sure the appropriate reproducible things happen. And in doing a timing
test, you need to end with a sync for the same reason.
0inputs+0outputs (0major+325minor)pagefaults 0swaps
l1:~# /usr/bin/time tar xf linux-22.214.171.124.tar
0.14user 1.66system 2:39.68elapsed 1%CPU (0avgtext+0avgdata
0inputs+0outputs (0major+324minor)pagefaults 0swaps
echo 1 >/proc/sys/vm/drop_caches
time bash -c "YOUR TEST; sync"
This will give you a fair shot at being able to reproduce the results,
done on an otherwise unloaded system.
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark