Singapore Dedicated Server Bandwidth (Uplink) | Network latency | Environment monitoring
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Smokeping: deluxe latency measurement tool

Smokepine is a very nice tool to have. We run ours on and it is publicly accessible. We want customers to know what they are paying for. A ping of 30ms during off peak may be 200ms during peak to your particular location.

Web hosting companies have been offering uptime of 99.95%, regardless of size, regardless of infrastructure. Wow, anyone can offer great uptimes, the Internet must be really reliable, right? Not really. The Internet is a best effort network. Google for smokeping targets, and look at the charts available. Particularly for the 400 day chart, there's seldom solid, straight green lines.

How to interpret the graphs? Firstly, the host that the smokeping binary runs on does affect the results. We run smokeping on a pretty busy VPS. There are times where there's lots of backup activity going on, lots of disk IO, and lots of bandwidth usage, and that shows up as spikes just after midnight. Likewise, the choice of targets matters. Some of the targets are websites, and they do go down once in a while. Other targets like routers give very low priority to ICMP, which is the right thing to do, especially when swamped with traffic, and the packets come back alot slower than usual, although other traffic may not be affected. ping is a pretty good indicator of the health of the network otherwise.

One of the things that smokeping has caught is our main firewall slowing down packets. The firewall was configured to send out syslog messages, and the CPU simply could not cope, and ended up slowing packets and dropping around 3%. It has also been very good in cases where customers from specific countries report problems with the network. We can check back on SmokePing, and see if there's packet loss, and high latency during the period reported.

01 Jan 2008

[Sysadmin] Access to servers via mobile device and ssh
[Sysadmin] RAID 0 scaling on SCSI U320, Bonnie++ 1.93c benchmark results
[Sysadmin] TODO (Apr 2007)
[Sysadmin] Recover from mistakes in /etc/fstab or e2label usage
[Sysadmin] Server overloaded?
[Sysadmin] Server load high: CPU bound
[Sysadmin] Smokeping: deluxe latency measurement tool
[Sysadmin] Smokeping
[Sysadmin] Jul 08 to Oct 08 updates
[Sysadmin] Weak link - downtimes caused by the organic being
[Sysadmin] BIOS upgrades - uniflash - hotflash
[Sysadmin] Sizing for Virtual Private Server (VPS) & SSDs
[Sysadmin] iphone, ipod - bluetooth keyboard - Nokia e51
[Sysadmin] e2label, fdisk, /etc/fstab, mount, linux rescue, rescue disk, CentOS
[Sysadmin] opensuse, fix waiting for mandatory device, eth0, eth1, eth2, eth3
[Sysadmin] mount: could not find filesystem '/dev/root'
[Sysadmin] Parallels Virtuozzo Physical server to Container migration (vzp2v)
[Web hosting] DDOS (Distributed Denial of Service)
[Web hosting] Uptime for dedicated server, VPS and shared server
[Web hosting] Shared, Guaranteed and Dedicated Bandwidth
[Web hosting] Unmetered bandwidth
[Web hosting] Free domains?
[Web hosting] Joomla Scalability
[SPAM handling] Tracking applications which are exploited for mass spam mailing
[Buzzwords] Clusters, Clustering
[Security] Destruction of faulty hard disks
[Storage] Benchmark using iometer on linux
[SSD] Benchmark Intel X25-E and Intel X25-M flash SSDs
[SSD] Intel X25-E 64GB G1, 4KB Random IOPS, iometer benchmark
[SSD] Intel X25-M 160GB G2, 4KB Random IOPS, iometer benchmark
[SSD] Comparison of Intel X25-E G1 vs Intel X25-M G2
[cPanel] ClamAV version has reached End of Life! Please upgrade to version 0.95
[cPanel] How to install Java, ImageMagick and ffmpeg
[Perl] Opening text files for reading, and simple regexp (regular expressions)