Date: Thu, 8 Sep 2005 12:56:42 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Don Lewis <truckman@freebsd.org> Cc: freebsd-current@freebsd.org, kabaev@gmail.com Subject: Re: Odd performance problem (hitching) Message-ID: <200509081256.51220.doconnor@gsoft.com.au> In-Reply-To: <200508310155.j7V1t57O016802@gw.catspoiler.org> References: <200508310155.j7V1t57O016802@gw.catspoiler.org>
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On Wednesday 31 August 2005 11:25, Don Lewis wrote:
> On 31 Aug, Daniel O'Connor wrote:
> > On Tuesday 30 August 2005 17:50, Daniel O'Connor wrote:
> >> > You might try significantly decreasing MAXVNODES_MAX in
> >> > sys/kern/vfs_subr.c and rebuilding your kernel.
> >>
> >> OK..
> >> I'll try timing when the drop outs happen :)
> >
> > Hmm they appear to be every 10 seconds on the dot.
>
> Hmn, I wonder what runs every 10 seconds ...
I can't think of anything.. I tried stopping a few things (IM clients, smar=
td, etc)
My systat output seems a little odd too..
3 users Load 2.00 1.41 1.33 Sep 8 12:55
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 279336 43076 541224 79892 95848 count 2
All 427596 48604 11928120 105464 pages 4
Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt cow 1333 total
2115 3601 154 3741 2267 388 38 93180 wire 1001 0: clk
251840 act 2 1: at=
kb
15.2%Sys 5.3%Intr 18.9%User 0.0%Nice 60.6%Idl 60244 inact 3: si=
o1
| | | | | | | | | | 24996 cache 4: si=
o0
=3D=3D=3D=3D=3D=3D=3D=3D++>>>>>>>>>> 70852 f=
ree 7: ppc0
daefr 128 8: rtc
Namei Name-cache Dir-cache prcfr 47 9: pc=
m0
Calls hits % hits % 4 react 155 11: n=
vi
2463 2463 100 pdwak 12: p=
sm
36 zfod pdpgs 13: n=
px
Disks ad0 cd0 pass0 36 ofod intrn 14: a=
ta
KB/t 0.00 0.00 0.00 %slo-z 61024 buf 15: a=
ta
tps 0 0 0 167 tfree 39 dirtybuf
MB/s 0.00 0.00 0.00 35360 desiredvnodes
% busy 0 0 0 12471 8409s
ie all the process appear to be in disk wait, rather than sleep.
The hitching appears to synchronise with some disk activity but
it's not like the disk gets hammered every 10 seconds.
=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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