Dear Community,
at some point of time when FreeBSD10.3 was up to date I have tried zfs on root using a mirror of
two SSDs and I have been happy with that. The machine I have is not really a performance monster. The first lines of
After upgrading to FreeBSD11 I have observed spontanious crashes. In the release notes of FreeBSD11 I read that ARC compression has been enabled by default. Disabling ARC compression in /boot/loader.conf fixed that issue.
Since I run the new kernel the crashes occured again. My RAM is 2GB only but i have seen that the ARC usage has exceeded 1GB. Half of the RAM should be the limit for such a small machine. Limiting the ARC in /boot/loader.conf to 1GB fixed the problem again. Currently ports-mgmt/poudriere is busy building my ports using two builders while I can use a browser to edit this post. No issue so far anymore.
What do you think? Should I re-enable ARC compression on such a machine? Is the need of ARC usage limitation a regression or "just me" issue? Basically I am happy with the overall performance. It is a good opertunity to thank all contributors for the availability of such a nice system
! Marking the thread prefix with ZFS and Solved seems not to be available 
. The ZFS behaviour shouId be no real problem, as least for me. I just like to know your opinions. Thank you in advance!
at some point of time when FreeBSD10.3 was up to date I have tried zfs on root using a mirror of
two SSDs and I have been happy with that. The machine I have is not really a performance monster. The first lines of
dmesg show
Code:
Copyright (c) 1992-2017 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 11.1-STABLE #2 r324701: Tue Oct 17 21:29:08 CEST 2017
chris@esprimo.local:/usr/obj/usr/src/sys/ESPRIMO amd64
FreeBSD clang version 5.0.0 (tags/RELEASE_500/final 312559) (based on LLVM 5.0.0svn)
VT(vga): resolution 640x480
CPU: Intel(R) Pentium(R) D CPU 3.40GHz (3391.60-MHz K8-class CPU)
Origin="GenuineIntel" Id=0xf65 Family=0xf Model=0x6 Stepping=5
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0xe49d<SSE3,DTES64,MON,DS_CPL,EST,CNXT-ID,CX16,xTPR,PDCM>
AMD Features=0x20100800<SYSCALL,NX,LM>
AMD Features2=0x1<LAHF>
TSC: P-state invariant
real memory = 2147483648 (2048 MB)
avail memory = 2041008128 (1946 MB)
Event timer "LAPIC" quality 100
ACPI APIC Table: <PTLTD APIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)Since I run the new kernel the crashes occured again. My RAM is 2GB only but i have seen that the ARC usage has exceeded 1GB. Half of the RAM should be the limit for such a small machine. Limiting the ARC in /boot/loader.conf to 1GB fixed the problem again. Currently ports-mgmt/poudriere is busy building my ports using two builders while I can use a browser to edit this post. No issue so far anymore.
What do you think? Should I re-enable ARC compression on such a machine? Is the need of ARC usage limitation a regression or "just me" issue? Basically I am happy with the overall performance. It is a good opertunity to thank all contributors for the availability of such a nice system
! Marking the thread prefix with ZFS and Solved seems not to be available . The ZFS behaviour shouId be no real problem, as least for me. I just like to know your opinions. Thank you in advance!