The PCI bus vs slot confuses me. My 32 bit, 33 Mhz cards can process 132 Mbytes/sec. As I understand it, more than 1 PCI slot shares a single PCI bus. How fast is the PCI bus? This is from "lspci": 00:00.0 Host bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (rev 03) 00:01.0 PCI bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev 03) 00:07.0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIX4 ISA (rev 02) 00:07.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01) 00:07.2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB (rev 01) 00:07.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 02) 00:0d.0 SCSI storage controller: Adaptec AHA-2940U2/U2W 00:0e.0 SCSI storage controller: Adaptec AHA-2940U2/U2W 00:11.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] 00:13.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03) 01:00.0 VGA compatible controller: Texas Instruments TVP4020 [Permedia 2] (rev 01) 02:0a.0 SCSI storage controller: Adaptec AHA-2940U2/U2W / 7890/7891 02:0e.0 SCSI storage controller: Adaptec AIC-7880U (rev 01) Do I have 3 PCI buses? Thanks, Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Vladimir I. Umnov Sent: Wednesday, August 25, 2004 1:12 PM To: linux-raid@xxxxxxxxxxxxxxx Subject: Re: Raid-0 speed > Also, doing a dd from 4 drives maxes out my read speed as per mdstat > at 160MB/s (How? PCI is 133MB/s and according to lspci all my > controllers are on the same bus). Does vmstat lie? NO! PCI 2.3 can about 512 MB/s - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
