On Fri 27 Apr 2001 at 15:36:27 -0700, Erik E. Fair wrote:
> One more data point - I am running this program on NetBSD/arm32 and 
> NetBSD/sparc in addition to alpha, and I only see the described 
> behavior on the alpha. That's why I'm asking here, and wondering 
> about MD TLB/cache/MMU/whatever issues.

I am seeing the same on i386 (pentium III 700 MHz).

cpu0: family 6 model 8 step 1
cpu0: Intel Pentium Pro, II or III (686-class)
real mem  = 133824512

With this dnetc client and 1.4.2:
dnetc v2.8002-446-CPR-99112201 client for NetBSD (NetBSD 1.4.2).

First, for a long while,  this speed, taken at a time the system is
fairly idle otherwise:

[Mar 27 23:01:19 UTC] Completed RC5 packet 1CE789F6:80000000 (4*2^28 keys)
                      0.00:09:04.88 - [1,970,583.16 keys/sec]
[Mar 27 23:01:19 UTC] Summary: 858 RC5 packets 4.22:33:50.04 - [1.97 Mkeys/s]

Then, 24 hours later, this slower speed:

[Mar 28 23:03:18 UTC] Completed RC5 packet 1D54C8B0:00000000 (4*2^28 keys)
                      0.00:15:30.23 - [1,154,266.64 keys/sec]
[Mar 28 23:03:18 UTC] Summary: 1024 RC5 packets 6.05:43:33.24 - [1.86 Mkeys/s]

This seems to be on a downward trend, and just now I got an extreme low.
Most other speeds in between are around 0.9 - 1.0 Mkeys/s, which is
about half of the initial speed.

[Apr 27 23:06:04 UTC] Completed RC5 packet 2A593E5B:E0000000 (2*2^28 keys)
                      0.00:09:04.13 - [986,652.39 keys/sec]
[Apr 27 23:06:04 UTC] Summary: 5880 RC5 packets 36.05:46:19.22 - [1.84 Mkeys/s]

Restarting gets back to the original speed immediately:

[Apr 28 00:00:05 UTC] Completed RC5 packet 2A3997BA:70000000 (4*2^28 keys)
                      0.00:09:05.49 - [1,968,367.70 keys/sec]
[Apr 28 00:00:05 UTC] Summary: 2 RC5 packets 0.00:15:47.63 - [1.96 Mkeys/s]

> 	Erik <fair@clock.org>
-Olaf.
-- 
___ Olaf 'Rhialto' Seibert - rhialto@polder --Soep van de dag, wat zal dat zijn
\X/ land.nl     --wat kan dat wezen, beter maar het ergste vrezen -Boy Bensdorp