Messages in this thread | | | Date | Wed, 30 Nov 2005 16:17:16 -0600 | From | "art" <> | Subject | Re: SCSI adaptec 19160 speed - 2.6.14-rt13 - Q for scsi experts |
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Re: SCSI adaptec 19160 speed - 2.6.14-rt13 - Q for scsi experts
On Tue, Nov 29, 2005 at 07:36:44PM -0600, art wrote: > > SCSI adaptec 19160 speed - 2.6.14-rt13 - Q for scsi experts > > > > Attached scsi disk sda at scsi0, channel 0, id 1, lun 0 > > Vendor: COMPAQ Model: BF14688286 Rev: HPB3 > > Type: Direct-Access ANSI SCSI revision: 03 > > scsi0:A:2:0: Tagged Queuing enabled. Depth 64 > > target0:0:2: Beginning Domain Validation > > target0:0:2: wide asynchronous. > > target0:0:2: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63) > > target0:0:2: Ending Domain Validation > > SCSI device sdb: 286749488 512-byte hdwr sectors (146816 MB) > > SCSI device sdb: drive cache: write through > > SCSI device sdb: 286749488 512-byte hdwr sectors (146816 MB) > > SCSI device sdb: drive cache: write through > > sdb: sdb1 > > Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0 > > Vendor: COMPAQ Model: BF14688286 Rev: HPB3 > > Type: Direct-Access ANSI SCSI revision: 03 > > scsi0:A:5:0: Tagged Queuing enabled. Depth 64 > > target0:0:5: Beginning Domain Validation > > target0:0:5: wide asynchronous. > > target0:0:5: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63) > > target0:0:5: Ending Domain Validation > > SCSI device sdc: 286749488 512-byte hdwr sectors (146816 MB) > > SCSI device sdc: drive cache: write through > > SCSI device sdc: 286749488 512-byte hdwr sectors (146816 MB) > > SCSI device sdc: drive cache: write through > > sdc: sdc1 > > Attached scsi disk sdc at scsi0, channel 0, id 5, lun 0 > > > > # hdparm -tT /dev/sdb > > /dev/sdb: > > Timing cached reads: 2316 MB in 2.00 seconds = 1157.90 MB/sec > > Timing buffered disk reads: 268 MB in 3.00 seconds = 89.26 MB/sec > > # hdparm -tT /dev/sdc > > > > /dev/sdc: > > Timing cached reads: 2512 MB in 2.00 seconds = 1255.49 MB/sec > > Timing buffered disk reads: 268 MB in 3.00 seconds = 89.32 MB/sec > > > > # hdparm -tT /dev/sdb & hdparm -tT /dev/sdc & > > [1] 3314 > > [2] 3315 > > > > /dev/sdb: > > /dev/sdc: > > Timing cached reads: Timing cached reads: 1228 MB in 2.00 seconds = 613.88 MB/sec > > 1316 MB in 1.99 seconds = 659.73 MB/sec > > Timing buffered disk reads: Timing buffered disk reads: > > 174 MB in 3.00 seconds = 57.91 MB/sec > > 170 MB in 3.05 seconds = 55.75 MB/sec > > ------------------------------------------------------------------------------------------ > > > > pci is 66Mhz theoretical throuhput ~ 250MB/s
And pci at 33mhz can do 130MB/s or so. With a bit over overhead those numbers sure look awful close to what a 33mhz pci bus can handle.
> > controller adaptec asc-19160 > > discs are 146GB-15krpm-cheetah > > > > one disc transfer 89MB/s > > > > adaptec speed with 2 disc on one channel = 57.91+55.75 = 113.66MB/s > > > > 71% of 160MB/s channel speed i expected ~90% > > > > any clue?
PCI bus not at 66mhz perhaps? Is it an add in card on onboard? I wonder if a pci bus that supports 66mhz has to drop everything to 33mhz if any of the cards installed are 33mhz only. Having never tried I don't know.
Len Sorensen
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# /sbin/lspci -v
02:00.0 SCSI storage controller: Adaptec AIC-7892B U160/m (rev 02) Subsystem: Adaptec 19160 Ultra160 SCSI Controller Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ 16 BIST result: 00 I/O ports at a000 [disabled] [size=256] Memory at e302a000 (64-bit, non-prefetchable) [size=4K] [virtual] Expansion ROM at 50000000 [disabled] [size=128K] Capabilities: [dc] Power Management version 2
02:02.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI]) Subsystem: Belkin Root Hub Flags: bus master, medium devsel, latency 32, IRQ 16 Memory at e3028000 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2
02:04.0 FireWire (IEEE 1394): Texas Instruments TSB43AB23 IEEE-1394a-2000 Controller (PHY/Link) (prog-if 10 [OHCI]) Subsystem: Adaptec: Unknown device 0030 Flags: bus master, medium devsel, latency 32, IRQ 16 Memory at e302b000 (32-bit, non-prefetchable) [size=2K] Memory at e3020000 (32-bit, non-prefetchable) [size=16K] Capabilities: [44] Power Management version 2
3 cards on same 16-int Adaptec 19160 at 66Mhz but---33Mhz ieee1394a ---- subsystem: Adaptec ???
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