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Jan
3
comment UPS Requirements - Max load or actual load?
You mean maximum, not average. The UPS has to be able to handle the peak load that you experience.
Jan
2
comment Avoid SSL warning when certificate is issued for root domain only
If there were such a way, that would be a huge security hole. A person who punches https://www.domain.com/ into their browser should either get something that can prove it's www.domain.com or it should get a security error. they should definitely not get some other site without a warning.
Dec
31
comment Linux memory fragmentation
@SaveTheRbtz A good reason to use swap on a production system is that it gives the system more options that it will use only if it thinks they are beneficial. Also, it permits modified pages that haven't been accessed in hours (and may never be accessed) to be ejected from precious physical memory. Lastly, it allows the system to sanely handle cases where much more memory is reserved than is used.
Dec
21
comment Is it possible having two Ethernet connections simultaneously on the same UTP Cat6 cable?
"you will greatly increase interferences and noise between the copper pairs" Do you have any reference for that claim? If that was true, then how would GigE work over the same physical wires?
Dec
12
comment Server exploited, bruteforcing ssh machines. Exploit keeps coming back
It honestly sounds like you've been assigned a security critical task that you're not qualified to do, and you should probably say so.
Dec
11
comment Super confused about possible NAT kerfuffle
When ping doesn't work, you try each of the components of a ping in turn to see which one fails. Does ARP work? Does the ping request go out? Does the destination machine receive it? Does it send a reply?
Dec
7
comment Find out limits of other user
Except it's clear from context that he doesn't mean when the user logs in.
Dec
5
comment Soft Lockup - CPU Stuck qemu-system-x86
You've withheld a lot of information from us. Did this only happen once? Was the system ever reliable? Does it always happen the same way? Are you doing anything unusual (such as running threads with SCHED_FIFO) that could cause a CPU to get stuck? Do you know the hardware is reliable? And so on.
Dec
4
comment How to change max file limits on a process
None of the solutions mentioned that /etc/security/limits.conf only affects logins?
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?)