Date: Mon, 13 Aug 2018 08:09:00 -0600 From: Alan Somers <asomers@freebsd.org> To: Marco Steinbach <coco@executive-computing.de> Cc: FreeBSD <freebsd-stable@freebsd.org> Subject: Re: Jails on ZFS yielding 100% load on gstat Message-ID: <CAOtMX2g=mtSfs=2NmdV6JHNvr%2BapV741dvSX%2B2H5YqOuxVn=-w@mail.gmail.com> In-Reply-To: <20180812205047.00002767@executive-computing.de> References: <20180812205047.00002767@executive-computing.de>
next in thread | previous in thread | raw e-mail | index | archive | help
Jails probably aren't the source of your problem. You need to find out what process or processes are responsible for all this activity. Since the write bandwidth is fairly low, you might have a process that's sync(2)ing or fsync(2)ing. too often. "gstat -o" will show if that's the case. You can also try running "top -mio" to see which processes are doing the most I/O. -Alan On Sun, Aug 12, 2018 at 12:50 PM, Marco Steinbach < coco@executive-computing.de> wrote: > Hi there. > > % zpool list > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > zroot 5.41T 670G 4.75T - 13% 12% 1.00x ONLINE - > > % uname -a > FreeBSD XXX 11.1-STABLE FreeBSD 11.1-STABLE #0 r322984 [...] amd64 > > > I'm running multiple jails on ZFS, using ezjail to manage them, > including a websever and a mailserver. The mailserver is using a MySQL > database, otherwise depending on dovecot and postfix. Very low volume, > just a few polls / logins per minute. > > I am experiencing very high loads as per gstat: > > dT: 1.021s w: 1.000s > L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name > 4 181 0 0 0.0 169 873 20.1 98.2| ada0 > 2 111 0 0 0.0 100 540 7.3 90.6| ada1 > 0 88 0 0 0.0 76 458 1.4 43.3| ada2 > 0 0 0 0 0.0 0 0 0.0 0.0| ada0p1 > 3 150 0 0 0.0 150 603 20.2 95.1| ada0p2 > 1 31 0 0 0.0 20 270 19.2 117.0| ada0p3 > 0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot0 > 0 0 0 0 0.0 0 0 0.0 0.0| ada1p1 > 1 85 0 0 0.0 85 341 8.4 68.9| ada1p2 > 1 25 0 0 0.0 15 200 0.9 75.0| ada1p3 > 0 0 0 0 0.0 0 0 0.0 0.0| ada2p1 > 0 62 0 0 0.0 62 251 1.6 9.9| ada2p2 > 0 26 0 0 0.0 15 208 0.5 42.0| ada2p3 > 0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot1 > 0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot2 > > > These loads lead to the system suffering from very much delayed > responses to even the basic task of echoing characters entered on the > console, consequently rendering the services offered unusable to the > users because of the delays. > > Restarting the jails (or even the whole machine at that) ends me up at > exactly the same situation. > > I do have lab machines for running load scenarios, so if anyone feels > compelled to lend a hand, please do. > > MfG CoCo > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAOtMX2g=mtSfs=2NmdV6JHNvr%2BapV741dvSX%2B2H5YqOuxVn=-w>