Messages in this thread |  | | From | tenthumbs@cybernex ... | Subject | Re: More cluuse, was: Re: Wierd IDE/Triton behavior | Date | Fri, 10 Jan 1997 19:31:56 GMT |
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On Fri, 10 Jan 1997 15:36:09 +0100, you wrote:
> Hallo, > > I have investigated more on the effect of decreased speed with EIDE drives > at least with Triton I and II boards on the recent kernel. > > [skipped]
I can confirm that something happened after 2.0.22.
I said "dd if=/dev/hda of=/dev/null bs=1024k count=100" on a drive with no mounted filesystems using a 2.0.22, a 2.0.27, and a 2.1.20 kernel. I also said "hdparm -tT /dev/hda" as a check.
Here are the results:
kernel | time for 100MB | MB/s | MB/s (hdparm) ---------+----------------+------+------------------ 2.0.22 | 88s | 1.14 | 1.14 2.0.27 | 166s | 0.60 | 0.65 2.1.20 | 87 | 1.15 | 1.16 | | |
With the 2.0.22 and the 2.1.20 kernels, the drive light appears to be continuously lit. With the 2.0.27 kernel, it flickers noticeably and regularly.
I purposely made these tests on a machine with an old 486 motherboard that's had a Cyrix 586 brain transplant. The drive is a 1.2GB Western Digital with a 128K internal cache.
Something definitely happened starting with 2.0.23.
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