[Cerowrt-devel] High Performance (SSH) Data Transfers using fq_codel?

[Frank Horowitz]

G’Day folks,

Long time lurker. I’ve been using Cero for my home router for quite a while now, with reasonable results (modulo bloody OSX wifi stuffola).

I’m running into issues doing zfs send/receive over ssh across a (mostly) internet2 backbone between Cornell (where I work) and West Virginia University (where we have a collaborator on a DOE sponsored project. Both ends are linux machines running fq_codel configured like so:
	tc qdisc
	qdisc fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms ecn

I stumbled across hpn-ssh <https://www.psc.edu/index.php/hpn-ssh> and —  of particular interest to this group — their page on tuning TCP parameters:

<http://www.psc.edu/index.php/networking/641-tcp-tune>

N.B. their advice to increase buffer size…

I’m curious, what part (if any) of that advice survives with fq_codel running on both ends? 

Any advice from the experts here would be gratefully received!

(And thanks for all of your collective and individual efforts!)

Cheers,
	Frank Horowitz

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