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Nov
4
comment How to check current TCP Congestion Window on Linux?
Thanks. Still would like to be able to verify though.
Nov
4
comment How to check current TCP Congestion Window on Linux?
Yes, that only shows the value if you have changed it yourself unfortunately. I'm looking for a way of finding the current value regardless of whether or not it was changed.
Nov
4
comment linux initcwnd and initrwnd via /etc/sysctl.conf
What if its a different interface that you want to change the setting of, other than the default one?
Nov
3
comment Recommended TCP keepalive settings for a busy server
Hmm, not sure - I'll look into that, thanks!
Nov
3
comment Recommended TCP keepalive settings for a busy server
Redis holds all of its data in memory (we don't even have disk snapshotting enabled). Average response times from both servers are in the milliseconds. Yeah, there must be something odd going on, but not sure what yet.
Nov
3
comment Recommended TCP keepalive settings for a busy server
Specifically I'm seeing this from an app server communicating with a redis server. Neither server is stressed or responding slowly though.
Nov
3
comment Recommended TCP keepalive settings for a busy server
At the application level these errors are 'read ETIMEDOUT', but I'm not sure how I'd give you any lower-level info than that.
Nov
3
comment Recommended TCP keepalive settings for a busy server
Only timeout I can see is /proc/sys/net/ipv4/tcp_fin_timeout which is 60. Is that what you meant? (Just realised you might be talking about the timeout errors we have been getting - will try to get these for you)
Sep
30
comment How to reliable re-install nf_conntrack module after removal?
Hmm, lsmod returns nothing (and I haven't removed anything yet). Perhaps I'm misunderstanding something?
Sep
29
comment How to reliable re-install nf_conntrack module after removal?
@HBruijn - I realise that it's necessary for certain types of rules in iptables (like those using the state keyword), but as I understand it, if these rules are not being used, then it is unnecessary. Is there something non-iptables that uses it in a standard config?
Sep
29
comment HAProxy high CPU usage - configuration issue?
Splitting into two processes is an interesting idea that I had not considered, thank you. Static traffic is very low, as we are behind a CDN, however spitting http app calls and the websocket traffic might be worth taking a look at. I suppose it would complicate our DNS records a little bit, but not a big deal. I'd like to see if I'm doing anything terribly wrong with the config first, but will certainly consider this.
Sep
29
comment How to reliable re-install nf_conntrack module after removal?
Just to follow up. Do you know of a good way to check if the modules have been loaded back? I'm a little concerned that something might load them again without my knowledge
Sep
29
comment How to reliable re-install nf_conntrack module after removal?
Thanks. I think I've already removed/modified and iptables rules that use these modules. (Updated question now with this and your point about modprobe lists).
Sep
28
comment HAProxy high CPU usage - configuration issue?
@ChristopherPerrin - That's a long story which I don't want to get into here.
Sep
26
comment how do I disable the nf_conntrack kernel module in CentOS 5.3 without recompiling the kernel
Does anyone know how you'd reverse step 4 if you needed to?
Aug
31
comment Understanding ntpd entry in syslog
Thank you! I wonder why the error message couldn't just say something like this?
Aug
29
comment Simple method of detecting and reporting server outage?
@kasperd - In this case I'm monitoring for a very specific failure scenario, and ping will be sufficient.
Aug
28
comment Why might debian become unresponsive with virtually 0% CPU usage?
@AndrewSchulman I don't see anything in kern.log or syslog that looks like an error.
Jun
9
comment Too many file descriptors on Debian, ulimit -n has no effect
Are you able to elaborate on this a bit please?
Mar
8
comment Understanding difference between system and process memory in htop
Oh, and htop version is 0.8.3