From: "Gábor LENCSE" <lencse@hit.bme.hu>
To: users@dpdk.org
Subject: Re: Unexpected behavior when using mbuf pool with external buffers
Date: Wed, 22 Dec 2021 13:28:31 +0100 [thread overview]
Message-ID: <36e7779e-b2e1-657e-da42-bf14bb34e29a@hit.bme.hu> (raw)
In-Reply-To: <CA+xtTg0xThxPwuKnMrCZR+dqxSpv86bTW3wNok69Q7bfDzSukw@mail.gmail.com>
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Dear Michal,
12/22/2021 10:56 AM keltezéssel, Michał Niciejewski írta:
> auto tx_num = rte_eth_tx_burst(1, queue, mbufs.data(), rx_num);
I suspect that the frame is sometimes simply not transmitted at high rates.
The rte_eth_tx_burst() function reports the number of actually
transmitted frames. I usually send a frame using the following loop:
while ( !rte_eth_tx_burst(eth_id, 0, &pkt_mbuf, 1) )
;
> Did anyone have similar issues or know what could cause such behavior?
I met a somewhat similar issue, when I implemented the first version of
siitperf: https://github.com/lencsegabor/siitperf
Then I was not aware of RFC 4814 yet, so I always transmitted the very
same frame for throughput measurements, but I used a counter to be able
to uniquely identify the test frames for packet delay variation
measurement. I wanted to use the frame as a template and I modified its
counter (and checksum) field after sending. I have found that even if
the rte_eth_tx_burst() function reported that the frame was sent, it was
still in the buffer and I have rewritten its counter. (The receiver
reported no frame with counter value 0, and 2 frames with the highest
value of the counter.)
To circumvent the problem, I used an array of frames and I modified
always the next element (modulo array size).
Best regards,
Gábor
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next prev parent reply other threads:[~2021-12-22 12:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 9:56 Michał Niciejewski
2021-12-22 10:24 ` Van Haaren, Harry
2021-12-22 16:30 ` Michał Niciejewski
2022-01-18 13:41 ` Michał Niciejewski
2021-12-22 12:28 ` Gábor LENCSE [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-12-21 11:48 Michał Niciejewski
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