Mailinglist Archive: opensuse (1152 mails)

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Re: [opensuse] Re: Is 40 dropped packets out of 300,000 high? This is wired cat5 LAN
On 06/01/2017 03:59 AM, Carlos E. R. wrote:
On 2017-06-01 05:01, L A Walsh wrote:
James Knott wrote:
On 05/31/2017 06:29 PM, L A Walsh wrote:

Iface MTU
br0 9000 eth0 9000 eth2 1500 eth5 9000
Looks like someone's running jumbo frames.

Yep -- for about 15 years maybe? For some reason
it seems to involve maybe ~1/6th the normal
packet overhead.... ;-)
Except if a retry is needed.

Well, that depends on how many retries are needed. If a low number then
you're ahead with large frames. The history of this sort of thing is
interesting. Ethernet went with smaller frames than token ring, due to
packet loss caused by collisions. But token ring didn't have
collisions, as only one device, the one holding the token, could
transmit at a time. Token ring could have frames over 4K bytes, IIRC.
Same thing with IP. Back in the dark ages, the trunks travelled over
the mostly analog phone network, which had higher noise levels than
digital. So, originally dial up used 576 bytes.

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