From: Oliver Hartkopp <socketcan@hartkopp.net>
To: Marc Kleine-Budde <mkl@pengutronix.de>,
Ssagarr Patil <hugarsagar@outlook.com>,
Prabhakar Lad <prabhakar.csengg@gmail.com>
Cc: "linux-can@vger.kernel.org" <linux-can@vger.kernel.org>
Subject: Re: C_CAN: can frame drops
Date: Thu, 31 Jul 2014 16:11:21 +0200 [thread overview]
Message-ID: <53DA4E89.1080206@hartkopp.net> (raw)
In-Reply-To: <53DA39CF.2070303@pengutronix.de>
On 31.07.2014 14:42, Marc Kleine-Budde wrote:
> On 07/31/2014 02:41 PM, Ssagarr Patil wrote:
>>> But so far there was no feedback from Sagar, if it was at least helpful.
>>>
>> Yes it was beneficial I used MSG_WAITALL flag for recvmmsg() so that
>> it waits for n frames and there is no memory wastage.
>>
This is probably not usable for candump, which has to provide the displayed
CAN frames pretty fast. I think there's some timeout mechanism too, to stop
the infinitive waiting for n frames.
>> Also is it possible to configure qdiscs for improving the performance ?
>
> AFAIK qdiscs are only used in the tx path.
Yep! See:
http://rtime.felk.cvut.cz/can/socketcan-qdisc-final.pdf
Regards,
Oliver
next prev parent reply other threads:[~2014-07-31 14:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 14:48 C_CAN: can frame drops Ssagarr Patil
2014-07-23 16:04 ` Oliver Hartkopp
2014-07-23 16:33 ` Ssagarr Patil
2014-07-24 7:40 ` Ssagarr Patil
2014-07-24 18:09 ` Oliver Hartkopp
2014-07-25 8:20 ` Ssagarr Patil
2014-07-25 7:17 ` Marc Kleine-Budde
2014-07-25 8:13 ` Ssagarr Patil
2014-07-25 8:16 ` Marc Kleine-Budde
2014-07-25 8:22 ` Ssagarr Patil
2014-07-25 8:27 ` Marc Kleine-Budde
2014-07-25 8:35 ` Ssagarr Patil
2014-07-25 8:48 ` Marc Kleine-Budde
2014-07-25 9:47 ` Ssagarr Patil
2014-07-25 10:10 ` Marc Kleine-Budde
2014-07-25 11:22 ` Ssagarr Patil
2014-07-25 10:43 ` Oliver Hartkopp
2014-07-25 11:24 ` Ssagarr Patil
2014-07-30 11:28 ` Prabhakar Lad
2014-07-30 16:17 ` Oliver Hartkopp
2014-07-31 12:41 ` Ssagarr Patil
2014-07-31 12:42 ` Marc Kleine-Budde
2014-07-31 14:11 ` Oliver Hartkopp [this message]
2014-07-31 14:19 ` Prabhakar Lad
2014-12-18 9:41 ` [RFC] sched policies for candump Oliver Hartkopp
2014-12-18 12:33 ` Prabhakar Lad
2014-12-18 13:51 ` Oliver Hartkopp
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