Re: Feedback on preemptible kernel patch

safemode
2001-09-08T18:22:00Z

On Saturday 08 September 2001 13:33, Arjan Filius wrote:
> Hello Robert,
>
>
> I tried 2.4.10-pre4 with patch-rml-2.4.10-pre4-preempt-kernel-1.
> But it seems to hit highmem (see below) (i do have 1.5GB ram)
> 2.4.10-pre4 plain runs just fine.
>
> With the kernel option mem=850M the patched kernel boots an seems to run
> fine. However i didn't do any stress testing yet, but i still notice
> hickups while playing mp3 files at -10 nice level with mpg123 on a 1.1GHz
> Athlon, and removing for example a _large_ file (reiser-on-lvm).

Have you tried running it without an altered priority level (altered by you
that is)? I run freeamp without any special nice level and running it while
dbench is pushing the system into 25 load or something else is throttling the
system at 100% cpu and hogging 200MB of ram - it never skips. With or
without the patch. Some programs actually suffer from changing from default
priority. i see that with hdparm -t sometimes. This is on a 850Mhz athlon,
by the way. I find mpg123 to be slower than most other players. Try some of
them. If you're console only, freeamp is both a console and gui mp3 player.
I imagine xmms would be pretty fast too when you turn off any extras.

> My syslog output with highmem:
>
> Sep 8 18:10:16 sjoerd kernel: kernel BUG at
> /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16 sjoerd
> kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_wp_page+636/1088]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 080bdd5c ecx:
> f5764260 edx: f4d4c000 Sep 8 18:10:16 sjoerd kernel: esi: c26cca60
> edi: ffffffff ebp: c26ca134 esp: f4d4dec8 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process S11dhcpd (pid: 2507,
> stackpage=f4d4d000) Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0
> 0000005f 080bdd5c f5805f00 ffffffff 00000001 c012437d Sep 8 18:10:16
> sjoerd kernel: f5805f00 f4d49a00 080bdd5c f4c822f4 55d54065 f4d4c000
> f4d49a00 f5805f00 Sep 8 18:10:16 sjoerd kernel: f5805f1c c0111a17
> f5805f00 f4d49a00 080bdd5c 00000001 f4d4c000 00000007 Sep 8 18:10:16
> sjoerd kernel: Call Trace: [handle_mm_fault+141/224]
> [do_page_fault+375/1136] [do_page_fault+0/1136] [__mmdrop+58/64]
> [do_exit+595/640] Sep 8 18:10:16 sjoerd kernel: [error_code+52/64]
> Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: MAC unknown INTRUDERS??
> (tf) IN=eth0 OUT= MAC= SRC=192.168.0.5 DST=192.168.0.255 LEN=241 TOS=0x02
> PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=138 DPT=138 LEN=221 Sep 8 18:10:16
> sjoerd kernel: MAC unknown INTRUDERS?? (tf) IN=eth0 OUT= MAC=
> SRC=192.168.0.5 DST=192.168.0.255 LEN=96 TOS=0x02 PREC=0x00 TTL=64 ID=0 DF
> PROTO=UDP SPT=137 DPT=137 LEN=76 Sep 8 18:10:16 sjoerd kernel: kernel BUG
> at /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16
> sjoerd kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_anonymous_page+130/368]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010286
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 080c501c ecx:
> f5764260 edx: f4d4c000 Sep 8 18:10:16 sjoerd kernel: esi: c26c4fec
> edi: f5805f00 ebp: f4d497c0 esp: f4d4dea0 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process dhcpd (pid: 2508,
> stackpage=f4d4d000) Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0
> 0000005f 080c501c f4d497c0 f5805f00 00000001 c012420f Sep 8 18:10:16
> sjoerd kernel: f5805f00 f4d497c0 f4c63314 00000001 080c501c 080c501c
> f5805f00 ffffffff Sep 8 18:10:16 sjoerd kernel: 00000001 c012434e
> f5805f00 f4d497c0 080c501c 00000001 f4c63314 f4d4c000 Sep 8 18:10:16
> sjoerd kernel: Call Trace: [do_no_page+47/272] [handle_mm_fault+94/224]
> [do_page_fault+375/1136] [do_page_fault+0/1136] [do_munmap+86/640] Sep 8
> 18:10:16 sjoerd kernel: [fput+116/224] [do_brk+176/368]
> [sys_brk+187/240] [error_code+52/64] Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: kernel BUG at
> /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16 sjoerd
> kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_anonymous_page+130/368]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 40017000 ecx:
> f5735f7c edx: f4c88000 Sep 8 18:10:16 sjoerd kernel: esi: c26c9298
> edi: f5805d80 ebp: f4c945c0 esp: f4c89dc8 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process python (pid: 2456,
> stackpage=f4c89000) Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0
> 0000005f 40017000 f4c945c0 f5805d80 00000001 c012420f Sep 8 18:10:16
> sjoerd kernel: f5805d80 f4c945c0 f4c9c05c 00000001 40017000 40017000
> f5805d80 ffffffff Sep 8 18:10:16 sjoerd kernel: 00000001 c012434e
> f5805d80 f4c945c0 40017000 00000001 f4c9c05c f4c88000 Sep 8 18:10:16
> sjoerd kernel: Call Trace: [do_no_page+47/272] [handle_mm_fault+94/224]
> [do_page_fault+375/1136] [do_page_fault+0/1136]
> [block_read_full_page+240/688] Sep 8 18:10:16 sjoerd kernel:
> [error_code+52/64] [file_read_actor+113/224]
> [do_generic_file_read+505/1344] [generic_file_read+99/128]
> [file_read_actor+0/224] [sys_read+150/208] Sep 8 18:10:16 sjoerd kernel:
> [system_call+51/56]
> Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: kernel BUG at
> /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16 sjoerd
> kernel: kernel BUG at /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95!
> Sep 8 18:10:16 sjoerd kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_wp_page+636/1088]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: bffff960 ecx:
> f5764260 edx: f4ce4000 Sep 8 18:10:16 sjoerd kernel: esi: c26d04d0
> edi: ffffffff ebp: c26ca4a8 esp: f4ce5ec8 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process rc (pid: 2514, stackpage=f4ce5000)
> Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0 0000005f bffff960
> f5805780 ffffffff 00000001 c012437d Sep 8 18:10:16 sjoerd kernel:
> f5805780 f4c54dc0 bffff960 f4ca8ffc 55e30065 f4ce4000 f4c54dc0 f5805780 Sep
> 8 18:10:16 sjoerd kernel: f580579c c0111a17 f5805780 f4c54dc0
> bffff960 00000001 f4ce4000 00000007 Sep 8 18:10:16 sjoerd kernel: Call
> Trace: [handle_mm_fault+141/224] [do_page_fault+375/1136]
> [do_page_fault+0/1136] [__mmdrop+58/64] [do_exit+595/640] Sep 8 18:10:16
> sjoerd kernel: [error_code+52/64]
> Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: kernel BUG at
> /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16 sjoerd
> kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[filemap_nopage+300/1344]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 00000001 ecx:
> f5764260 edx: f4c3e000 Sep 8 18:10:16 sjoerd kernel: esi: c297ac20
> edi: 00000015 ebp: c270df9c esp: f4c3fb30 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process ncpserv (pid: 2513,
> stackpage=f4c3f000) Sep 8 18:10:16 sjoerd kernel: Stack: c02110b2 c0211160
> 0000005f 40016000 f4c54f00 f4c62140 00000001 00000019 Sep 8 18:10:16
> sjoerd kernel: f7af9960 f74f7a24 f74f7980 f4db9c40 c0124252 f4c54f00
> 40016000 00000001 Sep 8 18:10:16 sjoerd kernel: 400162a8 f4c62140
> ffffffff 00000001 c012434e f4c62140 f4c54f00 400162a8 Sep 8 18:10:16
> sjoerd kernel: Call Trace: [do_no_page+114/272] [handle_mm_fault+94/224]
> [do_page_fault+375/1136] [do_page_fault+0/1136] [file_read_actor+177/224]
> Sep 8 18:10:16 sjoerd kernel: [update_atime+68/80]
> [do_generic_file_read+1333/1344] [do_munmap+86/640] [update_atime+68/80]
> [error_code+52/64] [clear_user+46/64] Sep 8 18:10:16 sjoerd kernel:
> [padzero+28/32] [load_elf_interp+619/704] [load_elf_binary+1959/2704]
> [load_elf_binary+0/2704]
> [nfsd:__insmod_nfsd_O/lib/modules/2.4.10-pre4/kernel/fs/nfsd/nfsd+-13721617
>/96] [search_binary_handler+152/496] Sep 8 18:10:16 sjoerd kernel:
> [do_execve+380/496] [do_execve+403/496] [sys_execve+47/96]
> [system_call+51/56] Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: LOOUT REJECT TCP IN=
> OUT=lo SRC=127.0.0.1 DST=127.0.0.1 LEN=356 TOS=0x02 PREC=0x00 TTL=64
> ID=32512 PROTO=TCP SPT=32775 DPT=15607 WINDOW=32767 RES=0x00 ACK PSH FIN
> URGP=0 Sep 8 18:10:16 sjoerd kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_wp_page+636/1088]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 080b170c ecx:
> f4ce4260 edx: f5946000 Sep 8 18:10:16 sjoerd kernel: esi: c26dec2c
> edi: ffffffff ebp: c26ca2cc esp: f5947ec8 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process rc (pid: 156, stackpage=f5947000)
> Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0 0000005f 080b170c
> f752a080 ffffffff 00000001 c012437d Sep 8 18:10:16 sjoerd kernel:
> f752a080 f75282c0 080b170c f59de2c4 56197065 f5946000 f75282c0 f752a080 Sep
> 8 18:10:16 sjoerd kernel: f752a09c c0111a17 f752a080 f75282c0
> 080b170c 00000001 f5946000 00000007 Sep 8 18:10:16 sjoerd kernel: Call
> Trace: [handle_mm_fault+141/224] [do_page_fault+375/1136]
> [do_page_fault+0/1136] [copy_thread+136/160] [do_fork+1619/1792] Sep 8
> 18:10:16 sjoerd kernel: [write_chan+0/544] [sys_fork+20/32]
> [error_code+52/64] Sep 8 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69 Sep 8 18:10:16 sjoerd kernel: kernel BUG at
> /usr/src/linux-2.4.10-pre4/include/asm/highmem.h:95! Sep 8 18:10:16 sjoerd
> kernel: invalid operand: 0000
> Sep 8 18:10:16 sjoerd kernel: CPU: 0
> Sep 8 18:10:16 sjoerd kernel: EIP: 0010:[do_wp_page+636/1088]
> Sep 8 18:10:16 sjoerd kernel: EFLAGS: 00010282
> Sep 8 18:10:16 sjoerd kernel: eax: 00000043 ebx: 080b04e0 ecx:
> f5735f7c edx: c299a000 Sep 8 18:10:16 sjoerd kernel: esi: c2962850
> edi: ffffffff ebp: c292d82c esp: c299bec8 Sep 8 18:10:16 sjoerd
> kernel: ds: 0018 es: 0018 ss: 0018
> Sep 8 18:10:16 sjoerd kernel: Process init (pid: 1, stackpage=c299b000)
> Sep 8 18:10:16 sjoerd kernel: Stack: c0210bd2 c0210cc0 0000005f 080b04e0
> f752a140 ffffffff 00000001 c012437d Sep 8 18:10:16 sjoerd kernel:
> f752a140 f7528180 080b04e0 f751a2c0 5f910065 c299a000 f7528180 f752a140 Sep
> 8 18:10:16 sjoerd kernel: f752a15c c0111a17 f752a140 f7528180
> 080b04e0 00000001 c299a000 00000007 Sep 8 18:10:16 sjoerd kernel: Call
> Trace: [handle_mm_fault+141/224] [do_page_fault+375/1136]
> [do_page_fault+0/1136] [copy_thread+136/160] [do_fork+1619/1792] Sep 8
> 18:10:16 sjoerd kernel: [sys_fork+20/32] [error_code+52/64] Sep 8
> 18:10:16 sjoerd kernel:
> Sep 8 18:10:16 sjoerd kernel: Code: 0f 0b 83 c4 0c 8b 15 e8 2f 2a c0 89 f0
> 2b 05 ac ba 2a c0 69