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https://github.com/xdp-project/bpf-examples.git
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ba2c114db0
The BPF-prog "not_txq_zero" also needed to take into account that skb->queue_mapping usually isn't set for locally generated traffic. I worry that sockets can set another queue id that could override our (BPF choice) in netdev_pick_tx(). See sk_tx_queue_set() and sk_tx_queue_get(). Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
27 lines
527 B
Plaintext
Executable File
27 lines
527 B
Plaintext
Executable File
#!/usr/bin/bpftrace
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//BEGIN {
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// printf("Monitor TXQ usage\n");
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// printf(" - Remember: BPF set queue_mapping is one-less here (zero-indexed)\n");
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//}
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tracepoint:net:net_dev_start_xmit {
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$qm = args->queue_mapping;
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$dev = str(args->name, 16);
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@stat_txq_usage[$dev] = lhist($qm, 0,32,1);
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}
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/* Periodically print stats */
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interval:s:3
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{
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printf("\nPeriodic show stats - time: ");
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time();
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print(@stat_txq_usage);
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}
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/* Default bpftrace will print all remaining maps at END */
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//END {
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// printf("END stats:\n");
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//}
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