help with 'tar|rsh tar'

[Nikolas Britton]

On 6/24/06, Dan Nelson <dnelson at allantgroup.com> wrote:
> In the last episode (Jun 24), Nikolas Britton said:
> > On 6/23/06, Nikolas Britton <nikolas.britton at gmail.com> wrote:
> > > Thanks!, but I got rsh going. I first had to edit /etc/hosts.equiv,
> > > after that I figured it out:
> > >
> > > tar cf - . | rsh 192.168.1.242 'cd /data; tar xpvf -'
> > >
> > > I was thinking tar -f as in file.tar but it's not, you have to cd
> > > into the source directory you want to copy... anyways... I'm
> > > getting around 30MB/s now... it should be in the 50-60MB/s range...
> > > Good enough for now though. Thanks again...
> > >
> >
> > hostA = P4 3GHz Prescott, Intel 82547EI GigE, FreeBSD 6.1/i386.
> > hostB = Athlon64 3000, Marvell Yukon Lite GigE, FreeBSD 6.1/amd64.
> >
> > Anyone know why load is so high on hostA, is it because I used tar -v?
> > top shows:
> >
> > CPU states:  0.0% user,  1.5% nice, 26.2% system, 61.4% interrupt, 10.9%  idle
>
> That 61% interrupt looks bad, but I don't have any ideas.
>
> >  PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
> > 18698 nbritton    1 130   20  1292K   832K RUN    171:46 28.12% rsh
> > 18696 nbritton    1  -4  -20  1588K  1068K getblk  48:25  6.88% bsdtar
>
> Try raising the blocksize in tar.  The default is 10K.  This bumps it
> to 64K:
>
>  tar cbf 128 - . | ...
>


Using: tar cbf 256 - . | rsh ... tar xpbf 64 -
Looks like that fixed the problems on hostA because hostB is now the
problem. The GigE and RAID controller on hostB both sit on the same
33MHz/32-bit PCI bus (Asus A8R-MVP)... and that doesn't help... but
those numbers should be closer to 50MB/s (((33x32)/10)/2 = 52.8MB/s).

hostA:
Load  0.62  0.58  0.58
42.4%Sys  18.3%Intr  4.9%User  0.0%Nice 34.3%Idl
Disks   ad0   da0
KB/t   0.00   124
tps       0   257
MB/s   0.00 31.20
% busy    0    30

hostB:
Load  0.59  0.80  0.80
17.4%Sys  54.4%Intr  0.8%User  0.0%Nice 27.4%Idl
Disks   ad0   da0
KB/t   0.00   122
tps       0   255
MB/s   0.00 30.43
% busy    0    92 <<<---


Thanks again!
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