Messages in this thread | | | Subject | Re: High CPU usage (up to server hang) under heavy I/O load | From | Alan Cox <> | Date | Mon, 16 Aug 2004 11:57:26 +0100 |
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On Llu, 2004-08-16 at 10:13, Mark Watts wrote: > Would this also mean that if I stick a 64bit SATA raid card (a 3Ware 8506-4LP > in this case) into a 32bit pci slot, then I/O is always going to suck badly? > > ... cos I do, and I/O sucks :)
Seperate issue.
64bit DMA is 64bit addressing (ie can DMA from above 4GB). 64bit wide slot is double the speed for transfers. The 3ware 8xxx I thought could do 64bit addressing although the driver seems to indicate it cannot, so with over 4Gb it would hurt.
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