Re: [RFT] major libata update

[Ric Wheeler <ric@emc.com>]

One other note, it seems like this patch set has broken the write 
barrier support - is that a side effect of enabling NCQ still?

I see messages that claim flush barriers are enabled:

[root@c001n01 root]# mount -o 
barrier=flush,rw,noatime,nodiratime,data=ordered,notail /dev/sda10 /mnt/1
May 16 22:21:56 centera kernel: ReiserFS: sda10: found reiserfs format 
"3.6" with standard journal
[root@c001n01 root]# May 16 22:21:58 centera kernel: ReiserFS: sda10: 
using ordered data mode
May 16 22:21:58 centera kernel: reiserfs: using flush barriers
May 16 22:21:58 centera kernel: ReiserFS: sda10: journal params: device 
sda10, size 8192, journal first block 18, max trans len 1024, max batch 
900, max commit age 30, max trans age 30
May 16 22:21:58 centera kernel: ReiserFS: sda10: checking transaction 
log (sda10)
May 16 22:21:58 centera kernel: ReiserFS: sda10: Using r5 hash to sort names

But when I test with my synchronous write load, I am going at 6 times 
the normal rate (i.e., the rate I see with barriers disabled) ;-)

ric