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Date: Mon, 19 Feb 2018 14:26:53 +0000 (UTC)
From: Anand Prasad <anandnprasad@yahoo.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: "users@dpdk.org" <users@dpdk.org>
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Subject: Re: [dpdk-users] DPDK Performance tips
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Hi Thomas, et.al.
=C2=A0=C2=A0 Thanks for response.
=C2=A0=C2=A0 I have followed the advices provided in the links you have pro=
vided but still i see the problem.
Recently, I studied dpdk-pktgen application and developed an application ve=
ry much similar to that. I mean, have made device, rx and tx, memmory pool =
and cache size configurations that pktgen uses. pktgen seems work fine with=
out any Rx packet drop but my application reports packet drop.
=C2=A0=C2=A0 Any guess what could be wrong with my application?=20
=C2=A0=C2=A0 I see packet drops in my application, when I launch some other=
application (say browser or system monitor). But, in such situations, pktg=
en application works without any packet drops.
Regards,Anand Prasad=C2=A0=20
=20
On Wednesday, 13 December 2017 4:41 PM, Thomas Monjalon <thomas@monjalo=
n.net> wrote:
=20
13/12/2017 09:14, Anand Prasad:
>=C2=A0 Hi Dpdk team,
>=C2=A0 =C2=A0 Can anyone please share tips to get better DPDK performance?=
I have tried to run DPDK test applications on various PC configurations wi=
th different CPU Speeds, RAM Size/Speed and and PCIex16 2nd and 3rd generat=
ion connections... but I don't get very consistent results.
>=C2=A0 =C2=A0 The same test application does not behave similarly on 2 PC'=
s with same hardware configuration.But general observation is that, perform=
ance is better on Intel motherboard with 3rd generation PCIe slot. When tri=
ed on Gigabyte motherboard (even with higher CPU and RAM speeds), performan=
ce was very poor.
>=C2=A0 =C2=A0 The performance issue I am facing is the Packet Drop issue o=
n the Rx side.
>=C2=A0 Two PC's with exactly same hardware configuration, one PC drops pac=
kets after few hours, but in the other PC I don't observe packet drop
> Highly appreciate a quick response
> Regards,Anand Prasad
This is very complicate because it really depends on the hardware.
Managing performance requires a very good knowledge of the hardware.
You can find some basic advices in this guide for some Intel hardware:
=C2=A0=C2=A0=C2=A0 http://dpdk.org/doc/guides/linux_gsg/nic_perf_intel_plat=
form.html
You will also find some informations in the drivers guide. Example:
=C2=A0=C2=A0=C2=A0 http://dpdk.org/doc/guides/nics/mlx5.html#performance-tu=
ning
=20
>From vhuertas@gmail.com Wed Feb 21 18:20:22 2018
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From: Victor Huertas <vhuertas@gmail.com>
Date: Wed, 21 Feb 2018 18:20:21 +0100
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Subject: [dpdk-users] rte_eth_rx_queue_setup is returning error -28 (ENOSPC)
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Hi all,
I am trying to make an application for having various rx threads capturing
packets from various queues of the same NIC (to increase performance using
RSS on one NIC). I am basing the app on an example called l3fwd-thread.
However, when I try to create the rx queue in a port using the
rte_eth_rx_queue_setup function it returns an -28 error (ENOSPC).
Having a look at source code of rte_ethdev.c, where this function is
implemented, I have seen the only place where ENOSCP value is returned (see
below).
if (mp->private_data_size < sizeof(struct rte_pktmbuf_pool_private)) {
RTE_PMD_DEBUG_TRACE("%s private_data_size %d < %d\n",
mp->name, (int) mp->private_data_size,
(int) sizeof(struct rte_pktmbuf_pool_private));
return -ENOSPC;
}
Executing step by step (using Eclipse), I saw that the private_data_size of
the pktmbuf_pool was set to zero. And that was the reason why it returned
-ENOSPC.
Nevertheless in the init_mem function of the example, when the pktmbuf_pool
is created, the value for private_data_size as parameter is 0.
if (pktmbuf_pool[socketid] == NULL) {
snprintf(s, sizeof(s), "mbuf_pool_%d", socketid);
pktmbuf_pool[socketid] =
rte_pktmbuf_pool_create(s, nb_mbuf,
MEMPOOL_CACHE_SIZE, 0,
RTE_MBUF_DEFAULT_BUF_SIZE, socketid);
if (pktmbuf_pool[socketid] == NULL)
rte_exit(EXIT_FAILURE,
"Cannot init mbuf pool on socket %d\n", socketid);
else
printf("Allocated mbuf pool on socket %d\n", socketid);
#if (APP_LOOKUP_METHOD == APP_LOOKUP_LPM)
setup_lpm(socketid);
#else
setup_hash(socketid);
#endif
}
So this is contradictory. Why the example initializes the private_data_size
to 0 and then it provokes a bat rx queue initialization?
Or am I understanding it wrongly?
Thanks for your attention,
--
Victor