Date: Mon, 1 Apr 1996 17:57:57 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: toor@dyson.iquest.net (John S. Dyson) Cc: lehey.pad@sni.de, joerg_wunsch@uriah.heep.sax.de, freebsd-hackers@freebsd.org Subject: Re: Virtual Memory system (was: Interesting IDE perf results) Message-ID: <199604011557.RAA23477@labinfo.iet.unipi.it> In-Reply-To: <199604011340.IAA01196@dyson.iquest.net> from "John S. Dyson" at Apr 1, 96 08:40:29 am
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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/ ====================================================================
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