Date: Wed, 6 Feb 2002 11:38:20 +0100 (CET) From: BOUWSMA Beery <freebsd-user@dcf77-zeit.netscum.dyndns.dk> To: current@freebsd.org Subject: Re: Performance of -current vs -stable Message-ID: <200202061038.g16AcKG00671@beerswilling.netscum.dyndns.dk> References: <p05101401b88638b62611@[128.113.24.47]> <XFMail.020206010234.jhb@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Serwoas! %s wrote on %.3s, %lld Sep 1993 > > Could it be due to the DDB, INVARIANTS & WITNESS options in the > > kernel? If it is that's fine with me, I'm just wondering where > > that magnitude of a slowdown would be coming from. > WITNESS can really hurt. Quite possibly I should turn it off in GENERIC now (I Hmmm, a few weeks ago I did some totally unscientific testing, noting that -current was much slower than -stable, by playing an mp3 with an optimized `mpg123' on a 75MHz pentium machine, where the difference was far more obvious than on a faster machine. I suspected that WITNESS and similar goodies might be a problem, and even composed a lengthy message wondering about it, but what really got me wondering was the fact that -stable had far less idle time than the same hardware running NetBSD-current, so that I could do `useful' work under NetBSD while playing an mp3 cleanly, but such was difficult with FreeBSD-stable and impossible with -current. However, I suspect that such a question is more on-topic in -hackers or even -stable than here, but I'm wondering if I should extract any useful info from the message I composed but never sent, and post my kernel config and ask if there's anything obvious in there that would explain why FreeBSD's mpg123 takes ~60% CPU and NetBSD's ~30% (vs the ~90+% usage by -current)... Oh, I'll try rebuilding -current Real Soon^W^W later today, without WITNESS, and compare, just to stay on-topic for this list. thanks barry bouwsma To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200202061038.g16AcKG00671>