Bits Up!

Long router queue sizes on the web continue to be a hot networking topic - Jim Gettys has a long interview in ACM queue . Large unmanaged ...

You don't see a lot of HTTP Content-MD5 response headers, but I just discovered some piece of code that generates unpadded base 64 versi...

Last week I posted about a kernel patch that records how long out of order TCP packets are kept hidden from userspace while the kernel tri...

If packet N+1 of a TCP flow arrives before packet N, the receiving application does not see any data until packet N gets there. That's w...

A while back I mentioned that Google thinks TCP ought to be more aggressive . I must admit, this matches my own bias. I can barely count the...

Well that's funny. Just a few hours after my last post, which suggested that virtio based networking might be getting bested by the not-...

a lot of bits have been spilled over virtual network performance in v-bus vs virtio-net/virtio-pci.. (aka alacrity vm vs traditional kvm/qem...

This post will not be satisfying. Someone has posted some great datapoints about virtualized packet forwarding, which is great. But they don...

In this post , I mentioned google was seeing huge packet loss on syn-acks from their servers. At the time it looked like 2%. That sounded nu...

Really interesting post from Jerry Chu of Google . He says Google has data which shows that we ought to lower the initial RTO, increase the ...

I managed to get the little 5-volt 1 wire network I mentioned earlier , built up and running. Even fishing the wires wasn't too hard, ...

I have been working on enhancing network performance for the upcoming Firefox on Mobile . I jokingly refer to this work as "finding use...

A little while back I wrote about how prominent likely() and unlikely() are in the Linux kernel, and yet I could not find any performance m...

Last year I tossed an e-mail from the Linux kernel networking list in my "projtodo" folder. The mail talked about how the Linux TC...

The other day on kernelnewbies, the able Robert Day wondered whether or not anyone had quantified the effects of the likely() and unlikely(...

The Calgary IOMMU is a feature of most IBM X-Series (i.e. X86_64) blades and motherboards. If you aren't familiar with an IOMMU, it is s...

I am going to recommend another published paper because of how it talks about characterizing its own performance. That's not the point o...

Emre Kıcıman and Benjamin Livshits from Microsoft Research present some interesting data in their SOPS paper - AjaxScope: A Platform for Rem...

For quite a while my todo list has had an instruction to find and characterize the popularity of RSS vs ATOM . Which syndication format is m...

The eponymous Kode Vicious over at ACM's Queue magazine has an excellent rant on the value of measuring instead of assuming. I read it ...