| I found a problem that I'm still investigating if was introduced by this
| patch or if was already present. When sending 1 million 256 byte packets
| with ttcp over loopback, using ccid3 it is crashing, the test machine
| I'm using doesn't have a serial port, its a notebook, will switch to
| another that has and provide the backtrace. It doesn't happens every
| time.
|
CCID3 is difficult due to the TX queue. Small packets are faster on the
wire, fill up the TX queue faster. Since there is little loss on LANs,
the slow-start algorithm will soon reach link capacity; but CCID3 can
not deal effectively with high speeds.
What is known not to work well at the moment is bidirectional data
transfer (e.g. an echo server/client). This lead to the comment in
tfrc_rx_sample_rtt(); the support for bidirectional data transfer
needs some more work, which however requires to make one-directional
transfer work well first.
| Here is tfrc_rx_hist_alloc back using ring of pointers with the fixed
| error path.
|
Thank you - I was just about to send a similar patch as update since
you clearly identified this bug. I will resubmit with your version
and upload it to the test tree.
| +int tfrc_rx_hist_alloc(struct tfrc_rx_hist *h)
| {
| + int i;
| +
| + for (i = 0; i <= TFRC_NDUPACK; i++) {
| + h->ring[i] = kmem_cache_alloc(tfrc_rx_hist_slab, GFP_ATOMIC);
| + if (h->ring[i] == NULL)
| + goto out_free;
| + }
| +
| + h->loss_count = h->loss_start = 0;
| + return 0;
| +
| +out_free:
| + while (i-- != 0) {
| + kmem_cache_free(tfrc_rx_hist_slab, h->ring[i]);
| + h->ring[i] = NULL;
| }
| + return -ENOBUFS;
| }
|
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