From: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
To: Matthew Auld <matthew.auld@intel.com>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Subject: [Intel-gfx] Strange hugepages result?
Date: Thu, 10 Jun 2021 21:02:38 +0200 [thread overview]
Message-ID: <c9ea7221-cc54-3394-f664-3f819ecc6d06@linux.intel.com> (raw)
Hi, Matthew!
I got a funny result from the hugepages selftest when trying to break
out some functionality from shmem to make a ttm page pool for
cached-only TTM system bos.
It turns out that shmem computed the pagesizes using the underlying
pages rather than the dma segments, so when I changed that, hugepages
started failing.
https://patchwork.freedesktop.org/series/91227/
But when hacking the page-size computation to use the underlying pages,
it's fine again
https://patchwork.freedesktop.org/series/91336/
It seems like some assumption about huge dma segments is wrong, either
in our page-size calculation, in the selftest or in the actual huge page
setup. Could it be that huge sized segments are assumed to be properly
aligned?
/Thomas
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next reply other threads:[~2021-06-10 19:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 19:02 Thomas Hellström [this message]
2021-06-10 19:57 ` [Intel-gfx] Strange hugepages result? Matthew Auld
2021-06-11 5:44 ` Thomas Hellström
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