Date: Tue, 23 Feb 2021 08:40:22 -0800 (PST) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: Alexander Motin <mav@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 7d4c444374d5 - main - Bump CTL block backend threads from 14 to 32 per LUN. Message-ID: <202102231640.11NGeMsl017773@gndrsh.dnsmgr.net> In-Reply-To: <202102231603.11NG3auF089038@gitrepo.freebsd.org>
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> The branch main has been updated by mav: > > URL: https://cgit.FreeBSD.org/src/commit/?id=7d4c444374d53e54ce197138df64bf40c1fb05a3 > > commit 7d4c444374d53e54ce197138df64bf40c1fb05a3 > Author: Alexander Motin <mav@FreeBSD.org> > AuthorDate: 2021-02-23 15:58:56 +0000 > Commit: Alexander Motin <mav@FreeBSD.org> > CommitDate: 2021-02-23 16:03:32 +0000 > > Bump CTL block backend threads from 14 to 32 per LUN. > > This makes random read benchmarks look better on a wide ZFS pools. > I am not sure where the original value goes from, but it is there > for too long now. I would think this should be bounded by the number of cores/threads in the system. What happens on a 4 thread system with this value? > > MFC after: 1 week > --- > sys/cam/ctl/ctl_backend_block.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/sys/cam/ctl/ctl_backend_block.c b/sys/cam/ctl/ctl_backend_block.c > index 7ec8e32f7338..f50e47a2a6c1 100644 > --- a/sys/cam/ctl/ctl_backend_block.c > +++ b/sys/cam/ctl/ctl_backend_block.c > @@ -226,7 +226,7 @@ struct ctl_be_block_io { > > extern struct ctl_softc *control_softc; > > -static int cbb_num_threads = 14; > +static int cbb_num_threads = 32; > SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, > "CAM Target Layer Block Backend"); > SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN, > -- Rod Grimes rgrimes@freebsd.org
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