From: David Howells <dhowells@redhat.com>
To: kernel test robot <oliver.sang@intel.com>
Cc: dhowells@redhat.com, oe-lkp@lists.linux.dev, lkp@intel.com,
Christian Brauner <brauner@kernel.org>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Al Viro <viro@zeniv.linux.org.uk>,
John Hubbard <jhubbard@nvidia.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Miklos Szeredi <miklos@szeredi.hu>,
Amir Goldstein <amir73il@gmail.com>,
linux-unionfs@vger.kernel.org, ying.huang@intel.com,
feng.tang@intel.com, fengwei.yin@intel.com
Subject: Re: [dhowells-fs:iov-old-dio] [overlayfs] 05b2c21a37: phoronix-test-suite.stress-ng.SENDFILE.bogo_ops_s 370.2% improvement
Date: Tue, 06 Jun 2023 10:00:13 +0100 [thread overview]
Message-ID: <1844121.1686042013@warthog.procyon.org.uk> (raw)
In-Reply-To: <202306061226.7564fc39-oliver.sang@intel.com>
kernel test robot <oliver.sang@intel.com> wrote:
> commit:
> 83e79d429d ("shmem: Implement splice-read")
> 05b2c21a37 ("overlayfs: Implement splice-read")
An improvement is certainly feasible, though a 3.7x improvement would be quite
a surprise.
shmem_file_splice_read() and filemap_splice_read() have a shorter call chain
than using ->read_iter() with ITER_PIPE.
overlayfs now delegates the splice directly to the lower filesystem.
David
prev parent reply other threads:[~2023-06-06 9:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-06 6:01 [dhowells-fs:iov-old-dio] [overlayfs] 05b2c21a37: phoronix-test-suite.stress-ng.SENDFILE.bogo_ops_s 370.2% improvement kernel test robot
2023-06-06 9:00 ` David Howells [this message]
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