From owner-freebsd-hackers Mon Apr 1 07:59:31 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id HAA01878 for hackers-outgoing; Mon, 1 Apr 1996 07:59:31 -0800 (PST) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id HAA01868 for ; Mon, 1 Apr 1996 07:59:13 -0800 (PST) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id RAA23477; Mon, 1 Apr 1996 17:57:57 +0200 From: Luigi Rizzo Message-Id: <199604011557.RAA23477@labinfo.iet.unipi.it> Subject: Re: Virtual Memory system (was: Interesting IDE perf results) To: toor@dyson.iquest.net (John S. Dyson) Date: Mon, 1 Apr 1996 17:57:57 +0200 (MET DST) Cc: lehey.pad@sni.de, joerg_wunsch@uriah.heep.sax.de, freebsd-hackers@freebsd.org In-Reply-To: <199604011340.IAA01196@dyson.iquest.net> from "John S. Dyson" at Apr 1, 96 08:40:29 am X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Speaking of performance, possibly related to the VM system: Since 2.0, I have had the feeling that the system has become slightly less responsive for interactive applications such as xterms etc. I thought 2.0 was too unstable/young to report this, but 2.1R should not have should have cleaned up most problems. It's just a feeling, probably motivated by the fact that I have a 486/66 w/8MB and the new system appears to be a bit more memory-hungry, but when I switch OS (between 1.1.5 and 2.1R) I can clearly tell which one I am running just by looking at the response time when I move the mouse between two xterms. This especially when one of the processes has been idle for some time; it looks like 2.1R tend to pageout idle processes more than 1.1.5 did, or to spread pages on the swap area in a way which makes them harder to recover. Note that 1.1.5 has no unusual settings, while the 2.1R has been patched with phkmalloc, custom-built XF86_SVGA with only the minumum set of drivers, no unused servers etc. Both systems have custom, stripped down kernels. The same symptoms, though less evident, occurs on a system with 16MB. Is it just me ? Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================