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Dec
4
comment Find out limits of other user
While correct, this doesn't answer his question. He's not interested in the per-user limits enforced by PAM during login.
Dec
3
comment Why does data sit in Send-Q? TCP sessions freezing
Wow, that's a weird one. Packet loss can certainly result in long delays between when data is sent and when it's received.
Dec
3
comment Cisco 1941 EIGRP UP DOWN
Maybe one side sees the interface as a high-speed interface and the other side sees it as a low-speed interface? Try manually setting the hello and hold times on both sides.
Dec
3
comment Cisco 1941 EIGRP UP DOWN
Make sure EIGRP configuration is compatible on both sides.
Dec
1
comment High CPU usage on mongodb server when idle?
How is "Cpu(s): 3.0%us, 1.0%sy, 0.0%ni, 95.5%id, 0.3%wa, 0.0%hi, 0.1%si, 0.0%st" high load? That's 95+% idle.
Dec
1
comment High CPU usage on mongodb server when idle?
You are misreading the output. You'll notice that only one core is spending significant time in user space (18.2%) and the others are almost completely idle (over 95% idle). You only have 8 cores, so clearly that 2200% can't be CPU usage.
Nov
30
comment Can increased disk throughput increase CPU utilization?
It's hard to address the misconception behind that comment with just a comment because it's not precisely clear why you think that makes sense. CPUs do not wait for RAM the same way they wait for an SSD. When the CPU is waiting for an SSD, the CPU can do other things because the SSD does the work. When the CPU is waiting for RAM, that virtual core eventually cannot make further progress and cannot do anything else until the RAM is ready. This manifests as increased CPU usage as the CPU is used while it is working on getting the data from RAM.
Nov
30
comment Can increased disk throughput increase CPU utilization?
What does RAM have to do with anything?
Nov
27
comment Why are connections in FIN_WAIT2 state not closed by the Linux kernel?
@AdamRomanek An orphaned connection is one with no associated sockets, that is, one that can only be accessed by the kernel itself and that no process can perform an operation on.
Nov
25
comment Netcat UDP transfer never stop until terminated via CTRL+C
TCP has a way to say "I'm done". UDP doesn't.
Nov
25
comment Netcat UDP transfer never stop until terminated via CTRL+C
I don't think so. You're not expecting the listening program to stop by itself, are you? (How would it know?)
Nov
25
comment SSL Certificate non-www not working
"The site is not working" is not a helpful problem description. What precisely goes wrong?
Nov
25
comment Netcat UDP transfer never stop until terminated via CTRL+C
You can start here or here.
Nov
25
comment Website inaccessible until host is pinged from client (on a class A subnet)
Replicate the failure scenario and troubleshoot. Is the routing table correct? Is the next hop in the ARP cache? Does a SYN go out? Etcetera.
Nov
25
comment Get link speed of an virtio-net network adapter
The link speed of what link?
Nov
24
comment What does the following UDP connection mean?
It's not really a UDP connection. It's an SNMP connection, over UDP.
Nov
23
comment What does take all the cpu here?
There's no problem that needs to be fixed. He's not using his CPUs, so they're being given to someone else. Why is that a problem?
Nov
23
comment When a socket switch to TIME_WAIT state, why I can't see its inode number?
Sockets don't change to TIME_WAIT state, connections (or endpoints) do.
Nov
20
comment Our server is launching brute force attacks on other websites, please advise
Nuke it from orbit.
Nov
16
comment Drawbacks of setting a high I/O timeout?
"The way I see it, the risk is that the delayed I/O accumulate and fill up the I/O queue, crashing the system." That makes no sense. What I/O queue are you talking about? How could reads accumulate? And if this was a problem with writes at all, what would stop writes from accumulating regardless of the timeout?