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SubjectRe: HIGHMEM4G config for 1GB RAM on desktop?


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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