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kern/38970: slow crashdump on amd64 machine
>Synopsis: slow crashdump on amd64 machine
>Arrival-Date: Tue Jun 17 06:35:00 +0000 2008
>Originator: Simon Burge
>Release: NetBSD -current - problem has been around for a while
I've got two amd64 machines here.
A single CPU Opteron with 1GB of RAM and system disk is a
Fujitsu MHT2080BH on a svwsata. That machine can write a crash
dump at ~12MB/sec.
Another machine is an 8 CPU Intel machine with 16GB of RAM and
the system disk is a Seagate ST3500630NS on an ahcisata. This
machine can only write a crash dump out at about 200kB/sec.
Each new number ticking down takes around 5 seconds to appears.
Relevent parts of dmesg for the disk are:
ahcisata0 at pci0 dev 31 function 2: vendor 0x8086 product 0x2681
ahcisata0: interrupting at ioapic0 pin 19
ahcisata0: AHCI revision 1.1, 6 ports, 32 command slots, features
atabus1 at ahcisata0 channel 0
ahcisata0 port 0: device present, speed: 1.5Gb/s
wd0 at atabus1 drive 0: <ST3500630NS>
wd0: quirks 2<FORCE_LBA48>
wd0: 465 GB, 969021 cyl, 16 head, 63 sec, 512 bytes/sect x 976773168
Boot to single user and "reboot -d".
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