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May
18
comment RAM usage by Apache server in Wordpress Site
Are you having an actual problem with performance or something? Or would you just prefer your server waste more RAM?
May
13
comment Preventing theft of data on remotely deployed servers exposed to physical access
@giomanda And it's "threat model". And part of what it means is that you have to thoroughly understand what you're securing and what you're securing it from. You might use SEAL Team Six to defend Fort Knox from Al Qaeda, but not to defend your new plasma TV from neighborhood thieves.
May
13
comment UDP packet loss cause
It's hard to know because the OP only tells us what's the same about the two machines, not what's different. It could, for example, be power management -- the machine with the higher loss may not be able to process a burst of packets as quickly when waking after power management kicks in, so the hardware buffer gets full and the tail packets get dropped.
May
13
comment Preventing theft of data on remotely deployed servers exposed to physical access
@giomanda If you want computer to be a physical vault that can withstand physical attacks, it has to be physically constructed like a vault. This can be done, but it's expensive and complex. You need physical tamper detection linked to a circuit that physically remove sensitive data (typically the key used to encrypt the data at rest on the device) from storage. It will take a security expert to design the hardware and the software framework.
May
13
comment Preventing theft of data on remotely deployed servers exposed to physical access
It's not really clear what the threat model is. You want a device that is invulnerable to physical compromise? That's going to be very complex and expensive. Computers are not vaults. If you want a vault, you need a vault.
May
3
comment How to run a single-threaded application on multiple processor cores efficiently?
This is way too generic a description of the problem. To give you any kind of useful help, we'd need much more specific information.
Apr
29
comment My VPSs CPU load hardly go beyond 0.2. Am I wasting my money on unused resources?
Are you sure you're paying for 1.0? On many virtual hosting schemes, you are only permitted to burst to 1.0 and will find yourself brutally throttled if you stay there for long or often. (Because they've sold more vCPUs than physical CPUs.) For example, Amazon T2 instances are like this. If this is a t2.small, you're maxed.
Apr
23
comment KVM port-forwarding from ppp0 to VM's bridged NIC not working, but to VM's NAT NIC works?
Is the host connected wirelessly?
Apr
23
comment setup domain with random ip addresses
I've read that several times and I still can't figure out what "sends this request with different ip addresses" means. Do you mean to different IP address? Or from them? And, whichever, why do you think you need that and what do you think it will accomplish?
Apr
20
comment setup domain with random ip addresses
You should explain why you think you need that and what you think it will accomplish.
Apr
17
comment When should I consider to add more RAM to VPS instead of CPU?
The OS itself uses RAM for disk caching.
Apr
12
comment Difference between tcp recv buffer and tcp receive window size?
@David The aim of data in flight is not to avoid overfilling the buffer, it's to handle the delay introduced by the communications channel. Adapting to the bandwidth and latency of the communications channel is one issue, adapting to the application's read behavior is another.
Apr
10
comment multiple ips on same server
Why can't you plug any cable in eth2? Couldn't you plug in a machine and assign it 163.88.0.28?
Apr
6
comment Fast Ethernet UDP optimize receive buffers
The buffers are very unlikely to be a significant part of the issue. It's much more likely to be other parts of the network and the software.
Apr
6
comment CPU usage of server extremely low and webpage load time high?
What is that device? It seems like it has unbelievably poor performance.
Apr
1
comment What's a good RLIMIT_CORE setting if I only want backtrace?
I would suggest just modifying your program to generate a backtrace rather than a core dump in the first place, at least as a compile-time option.
Mar
30
comment Squid3 don't caching, always TCP_MISS/200
What makes you think the miss isn't legitimate?
Mar
30
comment php process eating CPU since October
How about investigating. For example, find the process that's eating the CPU and see what it's doing, what files it has open, and so on.
Mar
29
comment Server high memory and cpu - no leads
That really doesn't mean much. If there's no evidence of excessive I/O caused by memory pressure, I'd investigate the CPU usage.
Mar
27
comment Server high memory and cpu - no leads
The amount of memory paged out seems microscopic, less than 1GB on a machine with 32GB of RAM. That could be perfectly normal. I'd focus on the CPU usage unless/until you have better evidence that memory pressure is a problem.