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| author | Vladislav Grishenko <themiron@mail.ru> | 2026-07-30 15:48:55 +0500 |
|---|---|---|
| committer | Vladislav Grishenko <themiron@mail.ru> | 2026-08-03 01:06:01 +0500 |
| commit | f2606293c1007aa68a8bcf1e92ae3d64e250eadb (patch) | |
| tree | a804a66f12bf586f3724d959b40dab40e0862244 /accel-pppd/accel-ppp.conf.5 | |
| parent | 332daf3705c8f6ec2e04e041261f86ba7b8650a6 (diff) | |
| download | accel-ppp-sstp-ppposeq.tar.gz accel-ppp-sstp-ppposeq.zip | |
sstp: add ppposeq transport to avoid userspace HDLC framingsstp-ppposeq
A pty is a byte stream, so the tty flip buffer merges frames written
back to back and sstp has to re-delimit them with async HDLC escaping
and a CRC-16 FCS. On a 1452-byte payload that is ~3600 ns per frame,
most of it spent on the FCS.
PPPOSEQ is a pppox protocol whose socket is the ppp endpoint itself,
so one datagram is one frame and no framing is needed at all. The
same payload takes ~380 ns per frame, about 9 times less. Requires
kernel 2.6.37, the first with PX_MAX_PROTO 3, whose remaining slot
it claims.
Supported kernels are from 2.6.37 to 7.2.
The new ppp-mode option selects the transport; auto, the default,
falls back to async when the module is unavailable, so hosts with
prebuilt kernels are unaffected.
PPP_SYNC is removed, being disabled and unfixable over a pty: frame
boundaries cannot be recovered from the stream, and coalescing cannot
be prevented since frames arrive from the network stack.
Diffstat (limited to 'accel-pppd/accel-ppp.conf.5')
| -rw-r--r-- | accel-pppd/accel-ppp.conf.5 | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/accel-pppd/accel-ppp.conf.5 b/accel-pppd/accel-ppp.conf.5 index bfe97e38..bcddfed4 100644 --- a/accel-pppd/accel-ppp.conf.5 +++ b/accel-pppd/accel-ppp.conf.5 @@ -995,11 +995,26 @@ Timeout waiting reply from client in seconds. Default is 60. .TP .BI "hello-interval=" n -If this option is given and greater than zero then sstp will send echo-request every +If this option is given and greater than zero then sstp will send echo-request every .B n seconds and drop connection without a reply. Default is 60. .TP +.BI "ppp-mode=" auto|seqpacket|async +Specifies transport between sstp and the kernel ppp layer. +.br +.B seqpacket +- use the ppposeq module. One datagram carries one ppp frame, so no +HDLC framing is done in userspace. +.br +.B async +- use a pty with ppp_async and frame in userspace. Works on any kernel. +.br +.B auto +- use seqpacket if the module is available, otherwise async. +.br +Default is auto. +.TP .BI "accept=" ssl,proxy Specifies incoming connection acceptance mode. .br |