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Mar
5
comment High %sys utilization in Nginx cache node
If THP is causing issues that most likely means that you are doing too many memcpy/memmove operations (you have those in your perf report). That is probably because of your lua scripts. To further improve performance of the server you can try minimizing number of memory copies in your code.
Feb
19
answered Linux - NTP stopped working after recent update
Feb
10
comment Nginx uses both writev() and sendfile()
Also TLS will require using writev since (at least for now) kernel can not encrypt data for you.
Nov
29
awarded  Caucus
Nov
24
answered Oops in syslog and freeze the server with docker
Sep
30
awarded  Explainer
Sep
20
answered Linux Network tuning to prevent tcp rcvpruned and backlogdrop?
May
30
awarded  Yearling
Apr
24
comment FreeBSD Established Connections Maxing out at 300
It's most likely application scalability issue not connected to kernel.
Apr
24
comment “show_signal_msg: N callbacks suppressed” then pegged at 100% and machine unresponsive
No, I just suggested that "unresponsiveness" can be connected to codedumps being written to disk.
Apr
23
comment “show_signal_msg: N callbacks suppressed” then pegged at 100% and machine unresponsive
If 12 callbacks from show_signal_msg were suppressed that means that something segfaulted 13 times in a row. Do you have coredumps enabled on that box?
Apr
17
comment kvm hypervisor kernel panic
Memory failure? What does SEL (System Event Log) says?
Apr
11
reviewed Reject What is the t in drwxrwxrwt or the value of t?
Apr
2
revised How to safely restart an ubuntu server lamp stack?
edited tags
Mar
11
comment Centos 6.5 crashing with kernel panics
I suspect CPU failure.
Mar
11
answered bad page map bug during snapshot
Mar
3
revised Why does 1GBit card have output limited to 80 MiB?
added 37 characters in body
Feb
16
reviewed Approve How can I drop privileges and still clean up my pid file in /var/run?
Feb
14
comment freebsd 7.2 kern.threads.max_threads_per_proc doesn't change after reboot
kern.threads.max_threads_per_proc is read-write tunable so you should place it in /etc/sysctl.conf
Feb
6
comment Java causing kernel panic
It's kernel panic in interrupt context - most likely java is not a culprit there - just interrupt happen to strike in the middle of java execution.