> > 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 -- This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org