Bernd Schubert wrote: > Hello Peter, > > On Monday 19 January 2009 11:37:11 Peter Rabbitson wrote: >> Peter Rabbitson wrote: >>> Hi, >>> >>> I am experimenting with raid6 on 4 drives on 2.6.27.11. The problem I am >>> having is that no matter what chunk size I use, the write benchmark >>> always comes out at single drive speed, although I should be seeing >>> double drive speed (read speed is at near 4x as expected). >> Please disregard this, I appear to be having some sort of weird hardware >> congestion. Can someone explain what could be going on? > > I don't know what it is going on, but: > > >> Combined read speed - limited by the width of a 32bit 66mhz PCI (dev >> 02:04.0 below) > > No! You you do have PCI-X, so 64bit with 66MHz. Maybe you are even luckily and > it is as 133MHz, depends on how many other devices are connected to this bus. > lspci will always say it is running at 66MHz, though, it also might run at > 100 or 133 MHz, > And on the same bus (the last lspci) I have: 02:04.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05) Subsystem: Intel Corporation PRO/1000 GT Desktop Adapter Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 26 Memory at fc5a0000 (32-bit, non-prefetchable) [size=128K] Memory at fc580000 (32-bit, non-prefetchable) [size=128K] I/O ports at b000 [size=64] Expansion ROM at fc460000 [disabled] [size=128K] Capabilities: [dc] Power Management version 2 Capabilities: [e4] PCI-X non-bridge device Kernel driver in use: e1000 which afaik brings everything to 32bits no? -- 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
