> > What disk / cpu statistics are reported by iostat -xnzc 5
> > when your Windows -- Solaris / CIFS / ZFS transfer is
> > running?
>
> cpu
> us sy wt id
> 0 35 0 65
> extended device statistics
> r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
> 156.4 0.0 19997.9 0.0 0.4 5.1 2.5 32.5 13 19 c8t0d0
The average service time of 32 .. 38 milliseconds is quite high,
but it seems this is due to the use of NCQ on AHCI; there are
more than five commands active in the drive(r) at a time.
And there's almost no waiting (2.5 - 3 milliseconds).
On my amd64 x2 box and nvidia chipset sata controller (nv_sata)
there is no NCQ support, and the the results look quite different
(Windows xp H2testw read -- Solaris / ZFS / samba):
cpu
us sy wt id
2 25 0 74
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
305,8 0,0 39120,6 0,0 9,9 0,3 32,2 1,1 35 34 c8t1d0
cpu
us sy wt id
3 22 0 74
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
304,4 0,0 38872,8 0,0 9,0 0,3 29,5 1,1 35 34 c8t1d0
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