Subject: Re: 3.0.1: softdep + ffsv2 + 'heavy' load = pauses
To: None <netbsd-users@netbsd.org>
From: Mark Cullen <mark.r.cullen@gmail.com>
List: netbsd-users
Date: 07/26/2006 19:29:17
Greg A. Woods wrote:
> At Sun, 23 Jul 2006 20:17:24 +0100,
> Mark Cullen wrote:
>> Oh, I know :-) In my defense, the speed benchmarking is just for me
>> really, and I am quite happy comparing rough numbers with a benchmark
>> run several times for each different configuration, just to get a
>> general feel of the difference in performance. If I were to be doing any
>> serious benchmarking for the NetBSD folks, which might help them improve
>> performance, then I would certainly do it properly! :-)
>
> BTW, if you really want to get a good feel for how your system performs
> under various disk I/O loads then benchmarks/postmark is the test you
> should be running. You can easily adjust its parameters to more
> realistically model the normal production loads your system(s) will
> experience.
>
> (You might have to search for and manually download the source before
> you build the package. I wish NetApp hadn't done whatever they've done
> to try to stifle its maintenance and distribution -- sure doesn't make
> me want to buy or even use any of their product any more!)
Cool. I will have a look for that, thanks.
>
>
>> By externally observable do you mean listening for hard disk activity
>> and such?
>
> No, I meant by not having to dig through kernel data structures with a
> debugger and watch how often various kernel threads execute. :-)
Oh right.
>
>
> As for your system's ~1.0 load average, well the only thing using any
> significant amount of cpu, besides smbd, is mysqld, though I can't see
> it keeping the load average up that high and yet still only use that few
> minutes of CPU time in two days. However if you can run without the database
> for a while, see if killing it drops your load average down to "normal".
>
Already tried killing off mysql for a while. It appeared to make no
difference at all, just like everything else I have tried so far :-(
--
Mark Cullen <mark.r.cullen@gmail.com>