Date: Wed, 30 Mar 2016 14:17:10 +0200 From: maxnix <maxnix.bsd@gmail.com> To: Rick Miller <vmiller@hostileadmin.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: AIO Enabled? Message-ID: <20160330141710.0c7d3500@max-BSD> In-Reply-To: <CAHzLAVHx9o5PD45MUhnR28uZrxTGNCqd1eaQ0oqEYR1RaF85QQ@mail.gmail.com> References: <CAHzLAVHx9o5PD45MUhnR28uZrxTGNCqd1eaQ0oqEYR1RaF85QQ@mail.gmail.com>
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Il giorno Tue, 29 Mar 2016 14:42:57 -0400 Rick Miller <vmiller@hostileadmin.com> ha scritto: > Hi all, > > I found old mail threads and blog posts (circa 2006 - 2010) that > stated AIO is not enabled by default in FreeBSD. However, when > running strings on the kernel, it appears AIO bits may be available... > > $ sudo strings -n3 /boot/kernel/kernel | grep -i aio > aio_swake > freebsd32_aio_read > freebsd32_aio_write > freebsd32_aio_return > freebsd32_aio_suspend > freebsd32_aio_cancel > freebsd32_aio_error > freebsd32_oaio_read > freebsd32_oaio_write > freebsd32_aio_waitcomplete > freebsd32_aio_fsync > freebsd32_aio_mlock > AIOSTOP: bad channel 0x%x > AIOSYNC chan 0x%03lx pos %lu unimplemented > AIONWRITE > AIOGSIZE > AIOSSIZE > AIOGFMT > AIOSFMT > AIOGMIX > AIOSMIX > AIOSTOP > AIOSYNC > AIOGCAP > nfsaio > aio_prio_delta_max > aio_max > aio_listio_max > > aio(4) states it can be linked in t he kernel using options VFS_AIO or > dynamically using loader.conf or kldload suggesting it still is not > enabled by default. This brings me to a couple questions I hope are > easily answered. > > 1) Is AIO still disabled by default in FreeBSD 10.x and newer? > 2) Does strings send the same output above to STDOUT irregardless of > whether AIO is enabled/disabled? > > > Thanks. > 1) I just checked the GENERIC config file, there is no VFS_AIO line in it, so aio(4) is still disabled by default. Don't know about FreeBSD 11, however. 2) Yes. I have a custom kernel without neither VFS_AIO nor aio.ko and strings(1) reports an output similar to yours. Maxnix
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