> Looking at the first few bytes in each dir of the initial TCP
> handshake (with tcpdump) I see:
>
> 0x: 4500 0030 24da <= from plan9 to freebsd
>
> 0x: 4500 0030 d249 4000 <= from freebsd to plan9
>
> Looks like FreeBSD always sets the DF (don't fragment) bit
>
yes, but i was not refering to the adjusting which isnt changed here. only
the tcpmtu() call that got added.
yes, it *should* not make any difference but maybe we'r missing
something. at worst it makes the code more confusing and cause bugs in
the future because one of the initializations of mss i
On Fri May 8 20:12:57 PDT 2015, cinap_len...@felloff.net wrote:
> do we really need to initialize tcb->mss to tcpmtu() in procsyn()?
> as i see it, procsyn() is called only when tcb->state is Syn_sent,
> which only should happen for client connections doing a connect, in
> which case tcpsndsyn() w
On Fri May 8 20:12:57 PDT 2015, cinap_len...@felloff.net wrote:
> do we really need to initialize tcb->mss to tcpmtu() in procsyn()?
> as i see it, procsyn() is called only when tcb->state is Syn_sent,
> which only should happen for client connections doing a connect, in
> which case tcpsndsyn() w
On May 9, 2015, at 7:43 AM, erik quanstrom wrote:
> easy enough until one encounters devices that don't send icmp
> responses because it's not implemented, or somehow considered
> "secure" that way.
Oddly enough, I don't see this 'problem' in the real world. And FreeBSD is far
from being alon
2015-05-09 10:25 GMT-07:00 Lyndon Nerenberg :
>
>
> On May 9, 2015, at 7:43 AM, erik quanstrom wrote:
>
> > easy enough until one encounters devices that don't send icmp
> > responses because it's not implemented, or somehow considered
> > "secure" that way.
>
> Oddly enough, I don't see this 'pro
On May 9, 2015, at 10:30 AM, Devon H. O'Dell wrote:
> Or when your client is on a cell phone. Cell networks are the worst.
Really? Quite often I slave my laptop to my phone's LTE connection, and I
never have problems with PMTU. Both here (across western Canada) and in the UK.
signature.as
> On May 9, 2015, at 10:25 AM, Lyndon Nerenberg wrote:
>
>
>> On May 9, 2015, at 7:43 AM, erik quanstrom wrote:
>>
>> easy enough until one encounters devices that don't send icmp
>> responses because it's not implemented, or somehow considered
>> "secure" that way.
>
> Oddly enough, I don'
2015-05-09 10:35 GMT-07:00 Lyndon Nerenberg :
>
> On May 9, 2015, at 10:30 AM, Devon H. O'Dell wrote:
>
>> Or when your client is on a cell phone. Cell networks are the worst.
>
> Really? Quite often I slave my laptop to my phone's LTE connection, and I
> never have problems with PMTU. Both her
for what it's worth, the original newreno work tcp does not have the mtu
bug. on a 8 processor system i have around here i get
bwc; while() nettest -a 127.1
tcp!127.0.0.1!40357 count 10; 81920 bytes in 1.505948 s @ 519 MB/s (0ms)
tcp!127.0.0.1!47983 count 10; 81920 bytes in 1.3779
> however, after fixing things so the initial cwind isn't hosed, i get a little
> better story:
so, actually, i think this is the root cause. the intial cwind is misset for
loopback.
i but that the symptom folks will see is that /net/tcp/stats shows
fragmentation when
performance sucks. evide
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