Date: Thu, 25 Aug 2016 03:52:21 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-ports-bugs@FreeBSD.org Subject: [Bug 212128] Default AIO settings break VirtualBox Message-ID: <bug-212128-13@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212128 Bug ID: 212128 Summary: Default AIO settings break VirtualBox Product: Ports & Packages Version: Latest Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: Individual Port(s) Assignee: freebsd-ports-bugs@FreeBSD.org Reporter: rkoberman@gmail.com On FreeBSD-11 and on older versions using AIO VirtualBox can lose disk acce= ss when the disk is heavily loaded. The symptoms are either the guest locking up with the guest's system "disk" showing continuous access while the host system shows no disk activity or b= y a crash on the guest. This can be fixed by adjusting the AIO sysctls to allow added capacity befo= re disk requests are lost. While I have no fix and this issue has existed for a long time, I suggest t= hat pkg-message have an added warning Here is a first-cut that could use some word-smithing: If AIO is enabled (always in FreeBSD-11.0 and newer), guests may lose disk access. This can be mitigated by adjusting AIO sysctls as follows: vfs.aio.aiod_lifetime=3D30000 vfs.aio.max_aio_procs=3D4 vfs.aio.max_aio_queue=3D65536 vfs.aio.max_aio_queue_per_proc=3D65536 vfs.aio.max_aio_per_proc=3D8192 vfs.aio.max_buf_aio=3D8192 These lines may be added to /etc/sysctl.conf to make them default. --=20 You are receiving this mail because: You are the assignee for the bug.=
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