Re: Running slower after raid0

I´m running kernel 2.6.8 from stable. After trying a lot of possible solutions, I faced (possibly) the solution. This machine has four memory slots and is able to deal with 4GB. When I use the four 1GB memory chips, I get the system running pretty slowly. If I take off one of the chips, everything turns out to be fine, and the raid performance goes up to 107MB/sec.

On 11/1/05, Tom Vier <tmv@comcast.net> wrote:

On Tue, Nov 01, 2005 at 11:05:53AM -0200, Bruno Diniz wrote:
> /dev/sda:
> Timing buffered disk reads: 170 MB in 3.01 seconds = 56.41 MB/sec
> /dev/sdb:
> Timing buffered disk reads: 180 MB in 3.01 seconds = 59.81 MB/sec
> /dev/md0:
> Timing buffered disk reads: 134 MB in 3.04 seconds = 44.09 MB/sec

What kernel are you running? I don't have it that bad, with 2.6.13, but it's
definately slower than earlier 2.6 kernels. raid0 performance used to be
very good. raid1 has always sucked (reads no faster than a single drive).

/dev/md0:
Timing buffered disk reads:  322 MB in   3.01 seconds = 107.06 MB/sec
/dev/sda:
Timing buffered disk reads:  216 MB in  3.03 seconds =  71.37 MB/sec
/dev/sdb:
Timing buffered disk reads:  218 MB in  3.01 seconds =  72.53 MB/sec

--
Tom Vier < tmv@comcast.net>
DSA Key ID 0x15741ECE

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