vinum in 4.x poor performer?
Marc G. Fournier
scrappy at hub.org
Tue Feb 8 21:32:34 PST 2005
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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