Date: Mon, 22 Sep 1997 21:39:08 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-chat@FreeBSD.ORG Cc: paulg@interlog.com (Paul Griffith) Subject: Re: Linux faster thasn FreeBSD Message-ID: <19970922213908.GA27029@uriah.heep.sax.de> References: <3426A034.76B7@asme.org> <Pine.BSI.3.95.970922125231.24717A-100000@shell1.interlog.com>
next in thread | previous in thread | raw e-mail | index | archive | help
As Paul Griffith wrote: > > Additionally, it seems like you chose the slowest disk for a swap > > partition and you probably didn't fine tune the kernel ;-). > > > > Pedro. > > So I should use the SCSI HD as my swap space ? Not really. Not after reading your hardware inventory again... With a decent SCSI controller, i would have immediately answered this question with `yes', however. > What basic fine tuning > would you suggest ? Oh well... You've got FreeBSD about at the worst supported hardware at all. ;-) FreeBSD's aic6[23]60 support plain sucks. We consider this driver unsupported (since nobody feels compelled enough to support it), and even with a better driver, the chip remains PIO or motherboard DMA, so it will either bind too much CPU, or rather slow. My tuning advice: try to pick up an old AHA-1540 (even 1540A will do), and then use the SCSI disk for pagiing space. I would be surprised if the machine doesn't feel faster after such a change. There's probably no other well-supported _and_ cheap SCSI controller for this class of hardware; my old scratchbox (386/40) also uses an AHA-1540A. For a PCI machine, the recommendation would be immediately to use a NCR 53c810 part, since they have about the best bang per buck ratio. j@uriah 201% dd if=/dev/rsd0 bs=1m count=20 of=/dev/null &\ dd if=/dev/rsd1 bs=1m count=20 of=/dev/null & [1] 15350 [2] 15351 j@uriah 202% 20+0 records in 20+0 records out 20971520 bytes transferred in 4.486693 secs (4674160 bytes/sec) 20+0 records in 20+0 records out 20971520 bytes transferred in 4.459271 secs (4702903 bytes/sec) 9.3 MB/s over a 10 MHz 8-bit SCSI bus doesn't seem to be very bad. :) (Yeah, i know, i should take sd1 off to the second bus, since this disk can shuffle > 8 MB/s sustained rate alone.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19970922213908.GA27029>