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| 1 | +<!-- Please send your reports to: [email protected] --> |
| 2 | + <project cat='proj'> |
| 3 | + <title>automtud: Better Jumbo Frame Support</title> |
| 4 | + |
| 5 | + <!-- Required section --> |
| 6 | + <contact> |
| 7 | + <person> |
| 8 | + <name> |
| 9 | + <given>John-Mark</given> |
| 10 | + <common>Gurney</common> |
| 11 | + </name> |
| 12 | + |
| 13 | + |
| 14 | + </person> |
| 15 | + </contact> |
| 16 | + |
| 17 | + <links> |
| 18 | + <url href="https://github.com/jmgurney/automtud">jmgurney/automtud on github</url> |
| 19 | + </links> |
| 20 | + |
| 21 | + <body> |
| 22 | + <p>The automtud script will allow a FreeBSD machine to send |
| 23 | + jumbo frames to machines that support them, while using normal |
| 24 | + sized frames for other machines.</p> |
| 25 | + |
| 26 | + <p>There are various advantages to using jumbo frames, such as |
| 27 | + reduced protocol overhead. It also means that TCP streams will |
| 28 | + not be segmented as much (though TSO helps) and in cases where |
| 29 | + LRO doesn't work well, less packets will be received.</p> |
| 30 | + |
| 31 | + <p>The script does not currently restore the state of the system |
| 32 | + it was in before starting. This means that you'll have to manually |
| 33 | + change the interface MTU, and manually delete host routes.</p> |
| 34 | + </body> |
| 35 | + |
| 36 | + <help> |
| 37 | + <task>Fix up various ethernet drivers to better support jumbo frames. |
| 38 | + Most ethernet drivers, though supporting scatter/gather, use a |
| 39 | + physically contiguous zone which can cause resource shortages.</task> |
| 40 | + |
| 41 | + <task>More testing is needed to ensure that things behave as |
| 42 | + expected. This means that when running the script, all machines |
| 43 | + work as expected w/o slow down or connectivity issues. Check |
| 44 | + `vmstat -z | grep mbuf' to ensure this isn't a problem with running |
| 45 | + out of jumbo_9k or jumbo_16k buffers do to ethernet driver |
| 46 | + issue.</task> |
| 47 | + </help> |
| 48 | + </project> |
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