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[tls] write data by small (1500 bytes) chunks, see http://www.belshe.com/ #961

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indutny commented Apr 21, 2011

This pull request was previously posted here, but this time it's low-level:

See http://www.belshe.com/2010/12/17/performance-and-the-tls-record-size/

ry commented Apr 21, 2011



indutny commented Apr 21, 2011

Sorry, no benchmarks. That is optimization for server client's - read article carefully! (Last time I'd posted that pull request - I missed that fact)


indutny commented Apr 21, 2011

Basically, if you're sending large chunks - browser can display parts of page before it stop receiving, b/c part of chunk can't be encrypted.


indutny commented Apr 21, 2011

BTW, try this in Chrome:

It's nodejs SPDY server :) And it's sending data in 1500 bytes chunks

pquerna commented Apr 29, 2011

I'm concerned about the effect this might have on throughput, and thats what it would be nice to have a benchmark of -- showing the effect is negligible.

1500 byte writes to SSL_write also would cause a bad behavior for many connections, because that would become 1500+ bytes with the TLS headers/protocol, and for most MTUs would end up being 2 packets instead of 1. (good thing to look at in wireshark over non-localhost)

If the benchmark shows this isn't a huge drop in throughput, I'd be interested in seeing what happens with using ~1300-1400 byte writes, which should drop you bellow the common MTUs.


indutny commented Apr 29, 2011

Hm... Nice point, @pquerna.

Mike has told me to use 1400 bytes, but I'd seen 1500 in chromium's flip_server - so I decided to use last one...
Probably that was wrong step.

Can you please help and perform some tests?


indutny commented Dec 7, 2011

I think we should come back to this issue, splitting can't be done in userland


indutny commented Jul 13, 2012


Can one of the admins verify this patch?


indutny commented Apr 18, 2013

fuck it.

@indutny indutny closed this Apr 18, 2013

isaacs commented Apr 18, 2013

fuck it.

@indutny you should be more friendly to pull request submitters ;P

Is it a special command for jenkins?

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