Re: [SQU] 2.4, diskd, FreeBSD seems a bit slow

On Wednesday 07 February 2001 15:57, Alex Rousskov wrote:
> IMHO, the precision of this hit response time comparison is very low,
> and no meaningful conclusions can be drawn from a two-point comparison
> of different environments. The 9msec difference you report (23 vs
> 32msec) may be due to the factors that have nothing to do with the file
> system choice. The difference may depend on time of day, memory hit
> ratio, client network connectivity, etc.
>
> If I were to compare plain UFS and diskd performance, I would either
> collect statistically significant number of points from different
> environments or benchmarked in a controlled environment.

For the statistics:

SuSE Linux 7.0 Kernel 2.2.16 ufs 256MB Ram / 4,2GB HD for /cache

HTTP requests per minute: 98.6

Median Service Times (seconds) 5 min 60 min:
        HTTP Requests (All): 0.05331 0.04047
        Cache Misses: 0.07825 0.18699
        Cache Hits: 0.01235 0.00865
        Near Hits: 0.15888 0.08265
        Not-Modified Replies: 0.00562 0.00379
        DNS Lookups: 0.05815 0.09971
        ICP Queries: 0.00000 0.00000

> > Median Service Times (seconds) 5 min 60 min:
> > HTTP Requests (All): 0.05951 0.09219
> > Cache Misses: 0.20843 0.20843
> > Cache Hits: 0.02317 0.02317
> > Near Hits: 0.12783 0.16775
> > Not-Modified Replies: 0.01235 0.01648
> > DNS Lookups: 0.01331 0.01046
> > ICP Queries: 0.00000 0.00000
> >
> > >Median Service Times (seconds) 5 min 60 min:
> > > HTTP Requests (All): 0.80651 1.00114
> > > Cache Misses: 1.46131 1.54242
> > > Cache Hits: 0.03241 0.03241
> > > Near Hits: 1.54242 1.54242
> > > Not-Modified Replies: 0.01035 0.01309
> > > DNS Lookups: 0.02336 0.03696
> > > ICP Queries: 0.00000 0.00000
> > >
> > >Jon Mansey wrote:
> > >> Median Service Times (seconds) 5 min 60 min:
> > >> HTTP Requests (All): 0.18699 0.18699
> > >> Cache Misses: 0.19742 0.20843
> > >> Cache Hits: 0.05951 0.05046
> > >> Near Hits: 0.15888 0.16775
> > >> Not-Modified Replies: 0.04519 0.04047
> > >> DNS Lookups: 0.02231 0.02336
> > >> ICP Queries: 0.00000 0.00000
> > >>
> > >> I thought diskd was supposed to improve disk access times?
> > >>
> > >> I think 50-60ms for cache hits is quite a bit slower than the 2.3
> > >> boxes I have running, they average 20ms.
> > >>
> > >> What times are others seeing?
>
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Georg Thoma  Tel. 0731/95448-207
               g.thoma@tiscon.de
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