From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: "Lombardo, Ed" <Ed.Lombardo@netscout.com>
Cc: users <users@dpdk.org>
Subject: Re: hugepage mapping to memseg failure
Date: Wed, 11 Sep 2024 01:36:44 +0300 [thread overview]
Message-ID: <20240911013644.58eaf50e@sovereign> (raw)
In-Reply-To: <CH3PR01MB84701012A4FCD4E6D03CD2628F9A2@CH3PR01MB8470.prod.exchangelabs.com>
2024-09-10 20:42 (UTC+0000), Lombardo, Ed:
> Hi Dmitry,
> If I use grub for hugepages will the hugepages always be contiguous and we won’t see the mapping to memsegs issue?
There are no guarantees about physical addresses.
On bare metal, getting continuous addresses at system startup is more likely.
On VM, I think, it is always less likely because host memory is fragmented.
> I am investigating your option 2 you provided to see how much VIRT memory increases.
There might be a third option.
If your HW and hypervisor permit accessing IOMMU from guests
and if the NIC can be bound to vfio-pci driver,
then you could use IOVA-as-VA (--iova-mode=va)
and have no issues with physical addresses ever.
Out of curiosity, why legacy memory mode is preferable for your app?
next prev parent reply other threads:[~2024-09-10 22:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-04 22:23 hugepage allocation mapping failure Lombardo, Ed
2024-09-06 13:42 ` hugepage mapping to memseg failure Lombardo, Ed
2024-09-07 20:35 ` Dmitry Kozlyuk
2024-09-10 20:42 ` Lombardo, Ed
2024-09-10 22:36 ` Dmitry Kozlyuk [this message]
2024-09-11 4:26 ` Lombardo, Ed
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