Messages in this thread | | | Date | Tue, 31 Aug 2004 18:46:27 -0400 | From | Timothy Miller <> | Subject | Re: HIGHMEM4G config for 1GB RAM on desktop? |
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Miquel van Smoorenburg wrote: > In article <41336CB1.6030105@techsource.com>, > Timothy Miller <miller@techsource.com> wrote: > >>Timothy Miller wrote: >> >>>Hey, that rings a bell. I have a 3ware 7000-2 controller with two >>>WD1200JB drives in RAID1. I find that if I dd from the disk, I get >>>exactly the read throughput that is the max for the drives (47MB/sec). >>>However, if I do a WRITE test, the performance is miserable. >>> >>>I have been going back and forth with 3ware for months, and what's odd >>>is that my drives with my controller in any machine other than the >>>primary box get great write throughput, BUT on my main box with 1G of >>>RAM, I get MISERABLE write throughput. When I should be getting >>>36MB/sec or faster, I get 8 to 12 MB/sec. >>> >>>Now, I have tried limiting the memory with a mem= boot option, but that >>>doesn't change the performance any. >> >>Scratch all this. Even if I physically remove half the memory, I STILL >>get the performance problem. > > > 3ware eh? > > Try setting /sys/block/sda/queue/nr_requests to twice the number > in /sys/block/sda/device/queue_depth
This will improve write performance? And if this helps, how do I make it permanent?
Thanks!
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