Hi all, running kvm-88 on a 2.6.26-1-amd64 kernel (stock Debian 5.0 kernel), I get the syslog on the host system flooded with the message: Aug 28 11:49:40 reactor kernel: [124035.611782] KVM_APIC_READ: read reserved register b0 The guest is running Debian 5.0 as well. Kernel 2.6.26-2-486. qemu is started with the command line: /opt/kvm-88/bin/qemu-system-x86_64 -hda web-int.img -m 512 -net nic,vlan=0,macaddr=52:54:12:34:02:01 -net tap,vlan=0 -k de -vnc :4 The message is always the same, only the timestamp differs. The log msg is generated quite often, at least 10000 times per minute. The guest system has 100% CPU usage, so has the qemu process on the host. I was doing a search engine crawler run -- lots of network I/O -- , when the log was filled. See the impressive growth rate of the syslog (crawler running) reactor:/virt# ls -l /var/log/syslog; sleep 60; ls -l /var/log/syslog -rw-r----- 1 root adm 17765119 2009-08-28 11:47 /var/log/syslog -rw-r----- 1 root adm 19124492 2009-08-28 11:48 /var/log/syslog (at least 99.9% of the new log entries are of the same kind as the one above ...) I seems to me that the message is related to network I/O because when I run a netpipe-tcp TCP performance benchmark between the guest and some real machine on the network the growth rate is even higher: reactor:/virt# ls -l /var/log/syslog; sleep 60; ls -l /var/log/syslog -rw-r----- 1 root adm 32404400 2009-08-28 11:59 /var/log/syslog -rw-r----- 1 root adm 73271420 2009-08-28 12:00 /var/log/syslog (throughput max: 240 MBit/s) When the guest system is idle (only shell prompt), the syslog growth rate is some magnitudes smaller: reactor:/virt# ls -l /var/log/syslog; sleep 60; ls -l /var/log/syslog -rw-r----- 1 root adm 29649924 2009-08-28 11:56 /var/log/syslog -rw-r----- 1 root adm 29708722 2009-08-28 11:57 /var/log/syslog How can I fix it? CU - cl reactor:/virt# cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 4 model name : AMD Phenom(tm) II X4 920 Processor stepping : 2 cpu MHz : 2807.120 cache size : 512 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmovpat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt bogomips : 5618.34 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate (the host system has a quad-core CPU) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
