> > I set the latency to 128 using setpci and now I get 66 MB/s. Other
> > values give slower transfer rates. Is there some other setting that
> > could improve it even more?
>
> Interesting. Did you set latency 128 for all devices or only for
> 3Dlabs card?
Only the 3Dlabs. The remaining cards are configured like this:
00:05.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink] (rev 78)
Subsystem: 3Com Corporation 3C905C-TX Fast Etherlink for PC Management NIC
Flags: bus master, medium devsel, latency 64, IRQ 25
00:06.0 Display controller: 3DLabs GLINT R3 (rev 01)
Subsystem: 3DLabs: Unknown device 0121
Flags: bus master, 66Mhz, medium devsel, latency 128, IRQ 27
00:07.0 RAID bus controller: Triones Technologies, Inc.: Unknown device 0008 (rev 07)
Subsystem: Triones Technologies, Inc.: Unknown device 0001
Flags: bus master, 66Mhz, medium devsel, latency 120, IRQ 26
00:07.1 RAID bus controller: Triones Technologies, Inc.: Unknown device 0008 (rev 07)
Subsystem: Triones Technologies, Inc.: Unknown device 0001
Flags: bus master, 66Mhz, medium devsel, latency 120, IRQ 26
00:08.1 IDE interface: Contaq Microsystems 82c693 (prog-if 80 [Master])
Flags: bus master, medium devsel, latency 0
00:08.2 IDE interface: Contaq Microsystems 82c693 (prog-if 00 [])
Flags: bus master, medium devsel, latency 0
00:08.3 USB Controller: Contaq Microsystems 82c693 (prog-if 10 [OHCI])
Flags: bus master, medium devsel, latency 0
00:09.0 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
Subsystem: Adaptec: Unknown device 0035
Flags: bus master, medium devsel, latency 64, IRQ 24
00:09.1 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
Subsystem: Adaptec: Unknown device 0035
Flags: bus master, medium devsel, latency 64, IRQ 28
00:09.2 USB Controller: NEC Corporation: Unknown device 00e0 (rev 02) (prog-if 20)
Subsystem: Adaptec: Unknown device 00e0
Flags: bus master, medium devsel, latency 68, IRQ 32
As you can see, the good IDE controller (Triones/Highpoint hpt374) has
a latency of 120. Disk transfer rates are still only half of what I
get with a 2.4 kernel. What could be the cause of this?
-- Måns Rullgård mru@users.sf.net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/