vinum in 4.x poor performer?

[Marc G. Fournier]

Is there a command that I can run that provide me the syscall/sec value, 
that I could use in a script?  I know vmstat reports it, but is there an 
easier way the having to parse the output? a perl module maybe, that 
already does it?

Thanks ...

On Wed, 9 Feb 2005, Marc G. Fournier wrote:

> On Tue, 8 Feb 2005, Dan Nelson wrote:
>
>> Details on the array's performance, I think.  Software RAID5 will
>> definitely have poor write performance (logging disks solve that
>> problem but vinum doesn't do that), but should have excellent read
>> rates.  From this output, however:
>> 
>>> systat -v output help:
>>>     4 users    Load  4.64  5.58  5.77
>> 
>>> Proc:r  p  d  s  w    Csw  Trp  Sys  Int  Sof  Flt
>>>     24     9282       949 8414*****  678  349 8198
>> 
>>> 54.6%Sys   0.2%Intr 45.2%User  0.0%Nice  0.0%Idl
>> 
>>> Disks   da0   da1   da2   da3   da4 pass0 pass1
>>> KB/t   5.32  9.50 12.52 16.00  9.00  0.00  0.00
>>> tps      23     2     4     3     1     0     0
>>> MB/s   0.12  0.01  0.05  0.04  0.01  0.00  0.00
>>> % busy    3     1     1     1     0     0     0
>> 
>> , it looks like your disks aren't being touched at all.  You are doing
>> over 99999 syscalls/second, though, which is mighty high.  The 50% Sys
>> doesn't look good either.  You may have a runaway process doing some
>> syscall over and over.  If this is not an MPSAFE syscall (see
>> /sys/kern/syscalls.master ), it will also prevent other processes from
>> making non-MPSAFE syscalls, and in 4.x that's most of them.
>
> Wow, that actually pointed me in the right direction, I think ... I just 
> killed an http process that was using alot of CPU, and syscalls drop'd down 
> to a numeric value again ... I'm still curious as to why this only seem sto 
> affect my Dual-Xeon box though :(
>
> Thanks ...
>
> ----
> Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
> Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664
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----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664