Re: AMD DX4-100 users: please test performance under 2.1.19/20

David C Niemi (
Mon, 6 Jan 1997 23:30:12 -0500 (EST)

On Thu, 2 Jan 1997, David C Niemi wrote:
> I am getting ca. 1/2 to 1/3 the normal memory I/O performance (causing
> pretty much everything to be very slow) on a 486-optimized 2.1.19 kernel.
> The system is an older ASUS PCI + VLB motherboard with an AMD DX4-100 CPU
> and 512 KB of secondary cache. Memory is 4 70-pin FPM 70 ns SIMMs being
> run (successfully) at 60 nsec (no, changing this or other CMOS settings
> does not help).

I have quite a few more data points now. The problem occurs from 2.1.15
through 2.1.20 inclusive, but does not occur on 2.1.14 or earlier kernels.
It also seems to be unique to the AMD DX4 processor, at least an Intel
DX2/66 does not have the same problem.

Could the author of the many i386/kernel modes that went in to 2.1.15 take
a look and see what might have gone wrong?


David 703-810-5538 Reston, Virginia, USA
------ Money talks, but it is wrong half of the time. -----