Date: Thu, 14 Apr 2022 09:47:19 +0300 From: Ze Dupsys <zedupsys@gmail.com> To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com> Cc: freebsd-xen@freebsd.org, buhrow@nfbcal.org Subject: Re: ZFS + FreeBSD XEN dom0 panic Message-ID: <f00bdfb0-4485-038b-387f-57161242b9ca@gmail.com> In-Reply-To: <YlWczLNsrTpNjk5P@Air-de-Roger> References: <4da2302b-0745-ea1d-c868-5a8a5fc66b18@gmail.com> <Yj8lZWqeHbD%2BkfOQ@Air-de-Roger> <48b74c39-abb3-0a3e-91a8-b5ab1e1223ce@gmail.com> <YkAqxjiMM1M1QdgR@Air-de-Roger> <22643831-70d3-5a3e-f973-fb80957e80dc@gmail.com> <Ykxev3fangqRGQcn@Air-de-Roger> <209c9b7c-4b4b-7fe3-6e73-d2a0dc651c19@gmail.com> <YlBOgFYNokZ0rTgD@Air-de-Roger> <1286cb59-867e-e7d0-2bd3-45c33feae66a@gmail.com> <YlRLN7aAxYzgb7kr@Air-de-Roger> <YlWczLNsrTpNjk5P@Air-de-Roger>
next in thread | previous in thread | raw e-mail | index | archive | help
On 2022.04.12. 18:37, Roger Pau Monné wrote: > > I have a patch to disable the bounce buffering done in blkback > (attached). Regarding this patch, it wouldn't apply on RELEASE 13.0 code, because i guess there are other changes, when updating code manually i got compile error, variable xen_cpuid_base not defined, and include paths do not have <contrib> at the start. So i applied it manually to main branch, commit: 2f0baec1ecb2e79cfb97a19e1bbfb27741365847, since there at least variable xen_cpuid_base existed. > While I think it's not directly related to the panic you are hitting, > it's long time since we should have disabled that. It should reduce > the memory consumption by blkback greatly, so might have the side > effect of helping with your issue related to pmap_growkernel. I think i do not understand this clearly. Was it an obsolete feature that had to be removed? > On my test box a single instance of blkback reduced memory usage from > ~100M to ~300K. On my lab system this seems to work quiet niceley as well. System is under load now for 17:36 hours, no panic, collecting vmstat. And what else is different, that VM start/stop script has not printed any error about adding block devices. So this seems promissing.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?f00bdfb0-4485-038b-387f-57161242b9ca>