Subject: High interrupt CPU usage with amanda backup on a SPARCclassic
To: None <port-sparc@netbsd.org>
From: Francis Devereux <francis@devrx.org>
List: port-sparc
Date: 02/06/2003 21:55:36 
Hi,

I have a SPARCclassic that I am using as an amanda backup server.  It has an
external 1GB SCSI disk and HP C1537A DDS-3 tape drive.  It is running NetBSD
1.6.

When the amanda is backing up over the network the CPU usage is very high
(see top output below), mainly interrupt and system, and the tape keeps
stopping and starting.  Is this normal, or is there any way I can make the
backup go faster?

Thanks,

Francis

load averages:  2.27,  2.35,  2.32
21:38:14
27 processes:  2 runnable, 24 sleeping, 1 on processor
CPU states:  1.0% user,  0.0% nice, 23.5% system, 72.5% interrupt,  2.9% idle
Memory: 16M Act, 6584K Inact, 156K Wired, 2176K Exec, 17M File, 884K Free
Swap: 128M Total, 2544K Used, 126M Free

  PID USERNAME PRI NICE   SIZE   RES STATE      TIME   WCPU    CPU COMMAND
  627 backup     2    4   424K  924K netio     26:52 26.37% 26.37% dumper
  631 backup    70    4   148K 1824K RUN       11:09 21.68% 21.68% taper
  626 backup    35    0   120K 1988K RUN        4:50  6.40%  6.40% taper
 2522 francis   29    0   204K  924K CPU        0:00  1.64%  0.98% top
 2514 francis   10    0   636K 1276K wait       0:01  0.88%  0.88% bash
 2435 backup     2    0   580K  376K netio      1:55  0.83%  0.83% gzip
    5 root      18    0     0K   14M syncer     0:29  0.05%  0.05% [ioflush]
  191 root       2    0   388K  732K select     1:22  0.00%  0.00% sshd
  123 root      10    0     0K   14M nfsidl     0:07  0.00%  0.00% [nfsio]
    4 root     -18    0     0K   14M reaper     0:06  0.00%  0.00% [reaper]
    3 root     -18    0     0K   14M pgdaemon   0:03  0.00%  0.00%
  [pagedaemon]
  124 root      10    0     0K   14M nfsidl     0:02  0.00%  0.00% [nfsio]
    6 root     -18    0     0K   14M aiodoned   0:01  0.00%  0.00% [aiodoned]
  126 root      10    0     0K   14M nfsidl     0:00  0.00%  0.00% [nfsio]
  125 root      10    0     0K   14M nfsidl     0:00  0.00%  0.00% [nfsio]
  205 root      10    0   248K  400K nanoslee   0:00  0.00%  0.00% cron
    1 root      10    0   412K  136K wait       0:00  0.00%  0.00% init