Re: Kernel Panic in SANDPOINT 5.99.64-GENERIC on DSM-G600

["Toru Nishimura" <locore64%alkyltechnology.com@localhost>]

Hi, Charles,

Thanks for detailed reports.  I made some casual FTP test run on
my NAS and got the following results so far.

NetBSD nas8245 5.99.64 NetBSD 5.99.64 (KUROBOX) #109: Sat Feb 11 10:46:39 JST 
2012
cpu0 at mainbus0: 8245 (Revision 0.4), ID 0 (primary)
cpu0: HID0 0x90c000<DOZE,DPM,ICE,DCE>, powersave: 1
cpu0: 195.12 MHz

It receives 1giga file from Pen3 933MHz running NB5.1.  The two
are housed in the same 100Mbps netgear switching hub, no GbE is
involved in this case.   It's known that the PC can send/receive a
single FTP stream with wire-saturating 11MiB/s speed.

ftp> put LARGE /dev/null
...
100% |**********************************|   976 MiB    4.76 MiB/s    00:00 ETA
1024000000 bytes sent in 03:25 (4.76 MiB/s)

On the reverse direction, my NAS can swallow FTP stream some
slower.

ftp> put LARGE /dev/null
...
100% |***********************************|   976 MiB    3.67 MiB/s    00:00 ETA
1024000000 bytes sent in 04:25 (3.67 MiB/s)

These facts indicate the 195MHz CPU lacks the muscle to saturate
the 100Mbps pipe.  Disk write to NAS case yields worse results.

ftp> put LARGE hoy
...
100% |***********************************|   976 MiB    1.65 MiB/s    00:00 ETA
1024000000 bytes sent in 09:48 (1.65 MiB/s)

wd0: <Hitachi HDS721680PLAT80>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(cmdide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

The 7200rpm Hitachi drive operates in UDMA100 and is known
capable of 100Mbps FTP streaming with modern CPUs.

Toru Nishimura / ALKYL Technology