Re: CVS commit: src/sys

[Martin Husemann <martin%duskware.de@localhost>]

On Mon, May 21, 2018 at 04:22:07PM +0200, Jaromír Dole?ek wrote:
> The very basic test is to do some moral equivalent of "dd if=foo
> of=/dev/null bs=64k" with some reasonably sized foo file, with default
> setting twice (once to test reading off the disk, second off cache),
> then set ubc_direct to 1 via DDB, remount the filesystem and re-run.
> Also would be good to check that the transferred contents are correct,
> e.g. via sha1.
> 
> If that doesn't trigger any panic, further test would be to run some
> non-trivial build with ubc_direct set to 1.

Here are timing results:

[/tmp] root@gemini # /usr/bin/time dd if=/netbsd of=/dev/zero bs=64k
213+1 records in  
213+1 records out
14005088 bytes transferred in 0.735 secs (19054541 bytes/sec)
        0.75 real         0.00 user         0.17 sys
[/tmp] root@gemini # /usr/bin/time dd if=/netbsd of=/dev/zero bs=64k
213+1 records in
213+1 records out
14005088 bytes transferred in 0.120 secs (116709066 bytes/sec)
        0.12 real         0.00 user         0.12 sys

and again with ubc_direct=1 (rebooted with -d, changed it in ddb and continued)

[/tmp] root@gemini #  /usr/bin/time dd if=/netbsd of=/dev/zero bs=64k
213+1 records in
213+1 records out
14005088 bytes transferred in 0.741 secs (18900253 bytes/sec)
        0.76 real         0.00 user         0.13 sys
[/tmp] root@gemini # /usr/bin/time dd if=/netbsd of=/dev/zero bs=64k
213+1 records in
213+1 records out
14005088 bytes transferred in 0.088 secs (159148727 bytes/sec)
        0.09 real         0.00 user         0.09 sys


Unfortunatley with ubc_direct enabled, it panics quickly:

[ 399.9154127] System Machine Check (660): Rev 0x1, Code 0x202, Flags 0x0
[ 399.9154127] System Machine Check (660): Rev 0x1, Code 0x202, Flags 0x0
[ 399.9154127]     Software Error Summary Flags   = 0x0000000000000001
[ 399.9154127]     Software Error Summary Flags   = 0x0000000000000001
[ 399.9154127]     CPU Device Interrupt Requests  = 0x4000000000000000
[ 399.9154127]     CPU Device Interrupt Requests  = 0x4000000000000000
[ 399.9154127]         DIR = 0x4000000000000000<Pchip 0 error>
[ 399.9154127]         DIR = 0x4000000000000000<Pchip 0 error>
[ 399.9154127]     Cchip Miscellaneous Register   = 0x0000000120000000
[ 399.9154127]     Pchip 0 Error Register         = 0x006038d678700041
[ 399.9154127]     Cchip Miscellaneous Register   = 0x0000000120000001
[ 399.9154127]         error    = 0x41<Error lost,Target abort>
[ 399.9154127]     Pchip 0 Error Register         = 0x006038d678700041
[ 399.9154127]         address  = 0x38d67870, 0x0<No DAC>
[ 399.9154127]         error    = 0x41<Error lost,Target abort>
[ 399.9154127]         command  = 0x6<PCI memory read>
[ 399.9154127]         address  = 0x38d67870, 0x0<No DAC>
[ 399.9154127]     Pchip 1 Error Register         = 0x0000000000000000
[ 399.9154127]         command  = 0x6<PCI memory read>
[ 399.9154127]     Pchip 1 Error Register         = 0x0000000000000000
[ 399.9154127] unexpected machine check:
[ 399.9154127] unexpected machine check:
[ 399.9154127]     mces    = 0x1
[ 399.9154127]     vector  = 0x660
[ 399.9154127]     mces    = 0x1
[ 399.9154127]     param   = 0xfffffc0000006080
[ 399.9154127]     vector  = 0x660
[ 399.9154127]     param   = 0xfffffc0000006480
[ 399.9154127]     pc      = 0xfffffc0001109fe0
[ 399.9154127]     pc      = 0xfffffc00010fb0fc
[ 399.9154127]     ra      = 0xfffffc00010fb120
[ 399.9154127]     code    = 0x100000202
[ 399.9154127]     ra      = 0xfffffc00010fb0fc
[ 399.9154127]     curlwp = 0xfffffc003fe3f980
[ 399.9154127]     code    = 0x100000202
[ 399.9154127]         pid = 0.2, comm = system
[ 399.9154127]     curlwp = 0xfffffc003fda0020
[ 399.9154127]         pid = 0.15, comm = system
[ 399.9154127] panic: 
  399.9154127] machine check
[ 399.9154127] cpu0: Begin traceback...
[ 399.9154127] alpha trace requires known PC =eject=
[ 399.9154127] cpu0: End traceback...
[ 399.9154127] WARNING: Unable to halt secondary CPUs (0x3)

Martin