Unfortunately I can't reproduce it as the load is gone now, also - no
logs, almost nothing. It's not the first time this happened.
[root@memcache1 ~]# memcached -h
memcached 1.4.5
ps axf: memcached -d -p 11211 -u nobody -c 4096 -m 7168
[root@memcache1 ~]# free
total used free shared buffers
cached
Mem: 6099872 1257096 4842776 0 149932
665644
-/+ buffers/cache: 441520 5658352
Swap: 8159224 17452 8141772
from what can I see in dmesg:
possible SYN flooding on port 11211. Sending cookies.
possible SYN flooding on port 11211. Sending cookies.
possible SYN flooding on port 11211. Sending cookies.
cpuinfo: 8 cores
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU L5520 @ 2.27GHz
stepping : 5
cpu MHz : 2261.060
cache size : 8192 KB
physical id : 1
siblings : 8
core id : 3
cpu cores : 4
apicid : 23
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : 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 ht tm syscall
nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est
tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips : 4521.97
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: [8]
[root@memcache1 ~]# top
top - 09:51:50 up 67 days, 12:57, 1 user, load average: 0.01, 0.02,
0.00
Tasks: 126 total, 1 running, 125 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 0.3%sy, 0.0%ni, 98.9%id, 0.0%wa, 0.0%hi,
0.6%si, 0.0%st
Mem: 6099872k total, 1256848k used, 4843024k free, 149956k
buffers
Swap: 8159224k total, 17452k used, 8141772k free, 665656k
cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
25427 nobody 15 0 433m 321m 400 S 4.7 5.4 112:29.40
memcached
2854 root 18 0 10232 612 592 S 0.3 0.0 9:58.64 hald-
addon-
stor
