Date: Thu, 6 Nov 2003 14:27:46 -0500 From: Louis LeBlanc <freebsd@keyslapper.org> To: FreeBSD Questions <freebsd-questions@FreeBSD.org> Subject: vfs.aio tuning question Message-ID: <20031106192745.GJ5053@keyslapper.org>
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Couldn't find any real explanation of these parameters online, but I noticed they appear to have disappeared in 4.8. I have a 4.6 system that shows the following parameters when sysctl -a is executed: vfs.aio.max_aio_per_proc: 72 vfs.aio.max_aio_queue_per_proc: 1024 vfs.aio.max_aio_procs: 32 vfs.aio.num_aio_procs: 0 vfs.aio.num_queue_count: 0 vfs.aio.max_aio_queue: 1024 vfs.aio.target_aio_procs: 4 vfs.aio.max_buf_aio: 72 vfs.aio.num_buf_aio: 0 vfs.aio.aiod_lifetime: 3000 vfs.aio.aiod_timeout: 1000 Now, I'm pretty sure these have something to do with asynchronous I/O, and I'm under the impression this is a bad thing to use. It appears this 4.6.2-RELEASE system is using it, but I don't know how to verify it or how to be sure it's not going to wreck something. If possible, I'd like someone to point me to a reference that describes the async features in some detail and particularly these parameters. Also, are they really gone from 4.8 or do they have to be 'turned on' somehow - and when is this an acceptable configuration? Thanks a lot folks. Lou -- Louis LeBlanc leblanc@keyslapper.org Fully Funded Hobbyist, KeySlapper Extrordinaire :) http://www.keyslapper.org ԿԬ All Finagle Laws may be bypassed by learning the simple art of doing without thinking.
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