Date: Tue, 25 Feb 1997 03:18:17 +1100 From: Bruce Evans <bde@zeta.org.au> To: nate@mt.sri.com, skynyrd@opus.cts.cwu.edu Cc: bde@zeta.org.au, hardware@freebsd.org Subject: Re: Memory speed (was Re: _big_ IDE disks?) Message-ID: <199702241618.DAA07615@godzilla.zeta.org.au>
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>The triton-1 machine running 2.1.7 consistently showed ~74MB/sec, while >the natoma p6-200 systems running ecc showed ~80MB/sec (both >just-before-lite2-current and 2.2 from about 1/26.) > >the triton-2 machines (1 w/96MB edo, the other with 64MB fpm) both showed >rates ~117MB when the systems were otherwise unloaded. These machines >both were running 2.2 from yesterday morning. Not good :-). I have Triton-1 (ASUS P55TP4XE) with non-EDO RAM and the benchmark runs at about 119.2MB/sec (1MB = 1048576). Oops, I forgot that I run with minor improvements that reduce the overhead of the inner loop from 59 cycles to 57. This probably accounts for the 119.2/117 difference. Triton-2 and EDO RAM probably don't make much difference. >These results are with the standard bios parameters for 60ns memory. >There are a few memory knobs besides normal timing in the p6np5 bios but I >haven't experimented. I suppose Rod Grimes would know what the optimal >settings are :) I use the standard knobs with everything turned up high. An x-2-2-2 write burst cycle is most important for this benchmark. Bruce Script started on Tue Feb 25 03:04:55 1997 ttyv1:bde@alphplex:/tmp> dd if=/dev/zero of=/dev/null bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 8.389282 secs (124989958 bytes/sec) ttyv1:bde@alphplex:/tmp> exit Script done on Tue Feb 25 03:05:07 1997 Calibrating clock(s) relative to mc146818A clock ... i586 clock: 132622829 Hz, i8254 clock: 1193105 Hz CPU: Pentium (132.62-MHz 586-class CPU) Origin = "GenuineIntel" Id = 0x52b Stepping=11 Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8> real memory = 33554432 (32768K bytes) avail memory = 30412800 (29700K bytes) DEVFS: ready for devices Probing for devices on PCI bus 0: chip0 <Intel 82437FX PCI cache memory controller> rev 2 on pci0:0:0
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