Date: Sat, 18 Apr 2020 16:51:48 +0200 From: Harry Schmalzbauer <freebsd@omnilan.de> To: freebsd-virtualization@freebsd.org Subject: =?UTF-8?Q?bhyve_11.1->stable/12_ZVOL-WinGuest_slowdown_=e2=80=93_r3?= =?UTF-8?Q?58848_far_beyond_imagination?= Message-ID: <3af0db9e-9044-5bbb-50d2-ef251ed231a1@omnilan.de>
next in thread | raw e-mail | index | archive | help
Hello, after upgrading my ancient ivy-bridge (Xeon E3, no vAPIC CPU support) from 11.1 to stable/12 I noteced a quiet heavy slowdown of my windows guest (Server 2012R2). The guest-disk is a ZVOL backed virtio-blk device, which I suspected suffers from performance regressions – especially since I use them in volmode=dev. But then I found the guest spending almost one full vCPU cycles in interrupt handling during light SQL load; something I rarely see on windows. No idea what caused the slowdown, but I remembered r358848 – which isn't MFCd yet, but I gave it a try. Word's can't describe the surprise. Never imagined any Win-Guest on bhyve can feel like that… Thanks a lot to Sir Burmeister et. al. Hope this will land in stable/12 soon. Thanks, -Harry
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3af0db9e-9044-5bbb-50d2-ef251ed231a1>