From: Zoltan Kiss <zoltan.kiss@linaro.org>
To: Saurabh Mishra <saurabh.globe@gmail.com>, users@dpdk.org, dev@dpdk.org
Subject: Re: [dpdk-dev] Huge pages to be allocated based on number of mbufs
Date: Thu, 17 Mar 2016 17:25:30 +0000 [thread overview]
Message-ID: <56EAE88A.5030004@linaro.org> (raw)
In-Reply-To: <CAMnwyJ11qXeRA1=6P4rxivZMOEcoV+K0hOCvXe2W04PkksHS1g@mail.gmail.com>
On 14/03/16 17:54, Saurabh Mishra wrote:
> Hi,
>
> We are planning to support virtio, vmxnet3, ixgbe, i40e, bxn2x and SR-IOV
> on some of them with DPDK.
>
> We have seen that even if we give correct number of mbufs given the number
> hugepages reserved, rte_eth_tx_queue_setup() may still fail with no enough
> memory (I saw this on i40evf but worked on virtio and vmxnet3).
>
> We like to know what's the recommended way to determine how many hugepages
> we should allocate given the number of mbufs such that queue setup APIs
> also don't fail.
I think you ran into a fragmentation problem. If you allocate the
hugepages later on after startup, chances are they are fragmented in the
memory. When you allocate a pool, DPDK needs a continuous area of memory
on the hugepages.
You should allocate them through the kernel boot params so they'll be as
continuous as possible.
>
> Since we will be running on low-end systems too we need to be careful about
> reserving hugepages.
>
> Thanks,
> /Saurabh
>
prev parent reply other threads:[~2016-03-17 17:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 17:54 Saurabh Mishra
2016-03-17 17:25 ` Zoltan Kiss [this message]
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