From: David Laight <David.Laight@ACULAB.COM>
To: 'David Howells' <dhowells@redhat.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
"Christian Brauner" <christian@brauner.io>,
Matthew Wilcox <willy@infradead.org>,
"Brendan Higgins" <brendanhiggins@google.com>,
David Gow <davidgow@google.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"kunit-dev@googlegroups.com" <kunit-dev@googlegroups.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Christian Brauner <brauner@kernel.org>,
David Hildenbrand <david@redhat.com>,
John Hubbard <jhubbard@nvidia.com>
Subject: RE: [RFC PATCH 9/9] iov_iter: Add benchmarking kunit tests for UBUF/IOVEC
Date: Fri, 15 Sep 2023 07:09:12 +0000 [thread overview]
Message-ID: <dcc6543d71524ac488ca2a56dd430118@AcuMS.aculab.com> (raw)
In-Reply-To: <20230914221526.3153402-10-dhowells@redhat.com>
From: David Howells
> Sent: 14 September 2023 23:15
>
> Add kunit tests to benchmark 256MiB copies to a UBUF iterator and an IOVEC
> iterator. This attaches a userspace VM with a mapped file in it
> temporarily to the test thread.
Isn't that going to be completely dominated by the cache fills
from memory?
I'd have thought you'd need to use something with a lot of
small fragments so that the iteration code dominates the copy.
Some measurements can be made using readv() and writev()
on /dev/zero and /dev/null.
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-09-15 7:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-14 22:15 [RFC PATCH 0/9] iov_iter: kunit: Cleanup, abstraction and more tests David Howells
2023-09-14 22:15 ` [RFC PATCH 1/9] iov_iter: Fix some checkpatch complaints in kunit tests David Howells
2023-09-14 22:15 ` [RFC PATCH 2/9] iov_iter: Consolidate some of the repeated code into helpers David Howells
2023-09-14 22:15 ` [RFC PATCH 3/9] iov_iter: Consolidate the test vector struct in the kunit tests David Howells
2023-09-14 22:15 ` [RFC PATCH 4/9] iov_iter: Consolidate bvec pattern checking David Howells
2023-09-14 22:15 ` [RFC PATCH 5/9] iov_iter: Create a function to prepare userspace VM for UBUF/IOVEC tests David Howells
2023-09-14 22:15 ` [RFC PATCH 6/9] iov_iter: Add copy kunit tests for ITER_UBUF and ITER_IOVEC David Howells
2023-09-14 22:15 ` [RFC PATCH 7/9] iov_iter: Add extract " David Howells
2023-09-14 22:15 ` [RFC PATCH 8/9] iov_iter: Add benchmarking kunit tests David Howells
2023-09-14 22:15 ` [RFC PATCH 9/9] iov_iter: Add benchmarking kunit tests for UBUF/IOVEC David Howells
2023-09-15 7:09 ` David Laight [this message]
2023-09-15 10:10 ` David Howells
2023-09-15 10:51 ` David Laight
2023-09-15 11:23 ` David Howells
2023-09-15 12:10 ` David Laight
2023-09-15 12:36 ` David Howells
2023-09-15 13:08 ` David Laight
2023-09-15 13:24 ` David Howells
2023-09-15 12:19 ` David Howells
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