Date: Wed, 5 Apr 2000 07:24:08 +0200 (CEST) From: Kun Limfjordsporter <freebeer@fluffy.gets.an.analprobe.dk> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: current@FreeBSD.ORG, fs@FreeBSD.ORG Subject: Re: FreeBSD random I/O performance issues Message-ID: <Pine.BSF.3.96.1000405070459.7687E-100000@fLuFFy.iNt.tElE.dK> In-Reply-To: <fa.kkq712v.1fn2iac@ifi.uio.no>
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On Wed, 5 Apr 19100, Matthew Dillon wrote:
> :performance -- innd was still unresponsive during the time that the
> :random history database files needed updating for somewhere around
> :10 to 15 seconds when handling a full feed.
>
> The innd problem is a different issue entirely, one related
> either to dirtying pages via mmap() or to excessive dirty
> pages in the buffer cache.
>
> You might be able to mitigate the problem somewhat by lowering
> the 'vfs.hidirtybuffers' sysctl, or maybe not.
I'll take door number two, please!
Just for grins, I went ahead with 5.0 and tuned the hidirtybuffers
down from the default of 1410 in steps down to 400, and nope, I still
see the ~6 seconds of freeze that I saw with the higher value.
No improvement. No consolation prize.
> :I don't see any problems with the latest code changes (of 2 1/2 days
> :ago), as the machine has been running without problems for more than
>
> That's good. I didn't expect any problems with the
> write-behind fixes, they are fairly trivial.
Now about this ahc0 RECOVERED ERROR that just showed up, I guess it
will be time to toss another Sun disk out the window Real Soon Now.
Anyway, I'll be looking forward to see what effect the rest of the
fix has on things, in hopes of matching either the NetBSD or Slowaris
performance but without the problems of either, please, thankyoumuch
thanks agin
from the fluffy your mother should have warned you about
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