Date: Fri, 26 Jul 2019 17:18:53 -0400 From: "James B. Byrne" <byrnejb@harte-lyne.ca> To: "David Christensen" <dpchrist@holgerdanske.com> Cc: freebsd-questions@freebsd.org Subject: Re: Help:: Listen queue overflow killing servers Message-ID: <6485e15869f8b205cf36811adaeed0e5.squirrel@webmail.harte-lyne.ca> In-Reply-To: <mailman.1039.1564172643.29249.freebsd-questions@freebsd.org> References: <mailman.1039.1564172643.29249.freebsd-questions@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
>>>>> On 7/26/19 4:58 AM, Paul Macdonald via freebsd-questions wrote: >>>>>> Over the past few months i've seen several boxes (4 or 5) become >>>>>> unresponsive as a result of a Listen queue overflow state. Since upgrading our hosts to 12.0 we have experienced many 'lockouts' of both bhyve vm guests and jails, all running on zfs. There are known issues with Bhyve guests getting into a deadlock state waiting on zio or encountering memory exhaustion in releases after FreeBSD-11.1. This has multiple causes: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231117 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594 We have worked around this by restricting max ARC to the net of system memory minus all vm allocations minus 4GB. We also noted that as the capacity of zfs pools approached 80% the deadlock is encountered more frequently. -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?6485e15869f8b205cf36811adaeed0e5.squirrel>