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meltdown etc.. arch kernel 4.14.11-1

HI Guys,

longtime openrc user here. Can you let us know when the relevant mitigations for meltdown and the other branch prediction exploits will be in the artix lts kernel?

Thanks
the cockerel

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #1 –
Our non lts kernel is already patched it is available in the system-testing repos.

EDIT: I didn't really read your question before answering, we will.

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #2 –
I ran short benchmarks before and after KPTI and new firmware. The performance on small-size file copy,  pipe throughput and system calls seem to have been significantly affected.

Before:

Code: [Select]
   BYTE UNIX Benchmarks (Version 5.1.3)

   System: latt: GNU/Linux
   OS: GNU/Linux -- 4.14.6-1-ARTIX -- #1 SMP PREEMPT Sun Dec 17 18:51:09 UTC 2017
   Machine: x86_64 (unknown)
   Language: en_US.utf8 (charmap="ANSI_X3.4-1968", collate="ANSI_X3.4-1968")
   CPU 0: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 1: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 2: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 3: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   20:29:20 up 53 min,  4 users,  load average: 0.24, 0.36, 0.20; runlevel 

------------------------------------------------------------------------
Benchmark Run: Thu Jan 04 2018 20:29:20 - 20:57:37
4 CPUs in system; running 1 parallel copy of tests

Dhrystone 2 using register variables       37237440.1 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                     4346.2 MWIPS (11.2 s, 7 samples)
Execl Throughput                               6930.6 lps   (30.0 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks       1206772.9 KBps  (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          365865.8 KBps  (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       2781821.8 KBps  (30.0 s, 2 samples)
Pipe Throughput                             2633111.8 lps   (10.0 s, 7 samples)
Pipe-based Context Switching                 256969.5 lps   (10.0 s, 7 samples)
Process Creation                              16859.3 lps   (30.0 s, 2 samples)
Shell Scripts (1 concurrent)                   9802.4 lpm   (60.0 s, 2 samples)
Shell Scripts (8 concurrent)                   2590.3 lpm   (60.0 s, 2 samples)
System Call Overhead                        3493960.4 lps   (10.0 s, 7 samples)

System Benchmarks Index Values               BASELINE       RESULT    INDEX
Dhrystone 2 using register variables         116700.0   37237440.1   3190.9
Double-Precision Whetstone                       55.0       4346.2    790.2
Execl Throughput                                 43.0       6930.6   1611.8
File Copy 1024 bufsize 2000 maxblocks          3960.0    1206772.9   3047.4
File Copy 256 bufsize 500 maxblocks            1655.0     365865.8   2210.7
File Copy 4096 bufsize 8000 maxblocks          5800.0    2781821.8   4796.2
Pipe Throughput                               12440.0    2633111.8   2116.6
Pipe-based Context Switching                   4000.0     256969.5    642.4
Process Creation                                126.0      16859.3   1338.0
Shell Scripts (1 concurrent)                     42.4       9802.4   2311.9
Shell Scripts (8 concurrent)                      6.0       2590.3   4317.2
System Call Overhead                          15000.0    3493960.4   2329.3
                                                                   ========
System Benchmarks Index Score                                        2051.4

After:

Code: [Select]
   BYTE UNIX Benchmarks (Version 5.1.3)

   System: latt: GNU/Linux
   OS: GNU/Linux -- 4.14.12-1-ARTIX -- #1 SMP PREEMPT Sat Jan 6 08:04:05 UTC 2018
   Machine: x86_64 (unknown)
   Language: en_US.utf8 (charmap="UTF-8", collate="UTF-8")
   CPU 0: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 1: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 2: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   CPU 3: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (5426.0 bogomips)
          Hyper-Threading, x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET, Intel virtualization
   10:11:57 up 1 min,  1 user,  load average: 0.17, 0.08, 0.03; runlevel 

------------------------------------------------------------------------
Benchmark Run: Sun Jan 07 2018 10:11:57 - 10:40:15
4 CPUs in system; running 1 parallel copy of tests

Dhrystone 2 using register variables       37309489.5 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                     4353.9 MWIPS (11.2 s, 7 samples)
Execl Throughput                               6024.0 lps   (30.0 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks        824374.2 KBps  (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          231631.3 KBps  (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       2358767.1 KBps  (30.0 s, 2 samples)
Pipe Throughput                             1296364.4 lps   (10.0 s, 7 samples)
Pipe-based Context Switching                 223604.9 lps   (10.0 s, 7 samples)
Process Creation                              14871.0 lps   (30.0 s, 2 samples)
Shell Scripts (1 concurrent)                   5008.4 lpm   (60.0 s, 2 samples)
Shell Scripts (8 concurrent)                   1547.2 lpm   (60.0 s, 2 samples)
System Call Overhead                         829213.5 lps   (10.0 s, 7 samples)

System Benchmarks Index Values               BASELINE       RESULT    INDEX
Dhrystone 2 using register variables         116700.0   37309489.5   3197.0
Double-Precision Whetstone                       55.0       4353.9    791.6
Execl Throughput                                 43.0       6024.0   1400.9
File Copy 1024 bufsize 2000 maxblocks          3960.0     824374.2   2081.8
File Copy 256 bufsize 500 maxblocks            1655.0     231631.3   1399.6
File Copy 4096 bufsize 8000 maxblocks          5800.0    2358767.1   4066.8
Pipe Throughput                               12440.0    1296364.4   1042.1
Pipe-based Context Switching                   4000.0     223604.9    559.0
Process Creation                                126.0      14871.0   1180.2
Shell Scripts (1 concurrent)                     42.4       5008.4   1181.2
Shell Scripts (8 concurrent)                      6.0       1547.2   2578.6
System Call Overhead                          15000.0     829213.5    552.8
                                                                   ========
System Benchmarks Index Score                                        1382.2

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #3 –
what is that testing program you ran?

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #6 –
@nous I think you can calculate that from the numbers. I'll do it for those three tests that were particularly impacted:

  • small-size file copy: -36%
  • pipe throughput: -51%
  • system calls: -76%

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #7 –
Holy moly. I had read about the performance degradation but didn't want to believe.

Re: meltdown etc.. arch kernel 4.14.11-1

Reply #8 –
Wow....that is significant to be sure. I can't say that I notice that much of a drop in performance for my needs on my old Dell Studio 1555 w/Intel Core 2 Duo.
I picked up this laptop used for $80 Canadian, spent about $100 for a new screen...pretty good deal. I am keeping my eyes open for an Amd powered laptop now. There are deals to be had if you seek them out. I was able to replace the screen on my present laptop myself...not difficult, so came out of it ok.

Best regards.
We should try to be kind to everyone.....we are all fighting some sort of battle.