dd version I used is 5.2.1, but...
hi
the version of dd I used is 5.2.1 (debian testing), but does anybody have an idea regarding my performance question?
regards
nicola
From: Nicola Fankhauser <[email protected]>
Date: Tue, Mar 01, 2005 at 08:54:25PM +0100
Quoted 5 lines
hi
the version of dd I used is 5.2.1 (debian testing), but does anybody have an idea regarding my performance question?
- please group messages in the same thread, thank you.
- if there is no answer within a day, wait some more - not everybody is constantly reading this list, you know.
- wrt your question: how are those raid-controllers on your motherboard? If they are all connected through a single pci-bus, the speed is reasonable. The best way to test if it's your motherboard or your raid, is to start multiple dd processes on different disks, or multiple bonnie++ processes on different disks, all concurrently, of course.
Good luck,
Jurriaan
Signature · 2 lines
Never forget: 2 + 2 = 5 for extremely large values of 2. Debian (Unstable) GNU/Linux 2.6.11-rc3-mm1 2x4734 bogomips load 0.71
hi
Quoted 1 line · Jurriaan
- please group messages in the same thread, thank you.
sorry for that.
Quoted 2 lines
- if there is no answer within a day, wait some more - not everybody is constantly reading this list, you know.
thanks for the tip.
Quoted 1 line
- wrt your question: how are those raid-controllers on your motherboard?
actually, I could not find very much info about this. all I know is:
1. the SiI 3114 chip is (by specification of the chip, found at SiI's site) connected by a PCI bus, 32bit wide, at 66mhz. however, I don't know whether Asus chose to connect it at 33mhz. lspci says it's 66mhz, but is this information trustworthy? nvidia tech specs of nforce4 sli (the chipset I have) says its PCI bridges are 33mhz only [1].
2. the nforce4 sata ports are (to my knowledge) directly connected to the nforce4 chipset.
Quoted 5 lines
If they are all connected through a single pci-bus, the speed is reasonable. The best way to test if it's your motherboard or your raid, is to start multiple dd processes on different disks, or multiple bonnie++ processes on different disks, all concurrently, of course.
good idea (thought about it too). results of concurrent reads on all eight drives show that the nforce4 sata ports perform quite well at 211MiB/s (52MiB/s per drive), however the SiI 3114 seemed to saturate at 129MiB/s (32MiB/s per drive). added, this gives at total throughput of 340MB/s.
non-concurrent dd gives for both controllers values seemingly bound by drive performance of 60MiB/s.
thanks & regards
nicola