Date: Fri, 3 Jun 2022 16:43:15 GMT From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 4ecb23602e03 - stable/13 - rtw88: update man page for loader tunable for >4GB of main memory Message-ID: <202206031643.253GhFpc021873@gitrepo.freebsd.org>
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The branch stable/13 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=4ecb23602e03ed3aa0f65ea3935347430f24b04c commit 4ecb23602e03ed3aa0f65ea3935347430f24b04c Author: Bjoern A. Zeeb <bz@FreeBSD.org> AuthorDate: 2022-05-05 21:17:40 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2022-06-03 15:51:52 +0000 rtw88: update man page for loader tunable for >4GB of main memory Mention the loader tunable from 6a50157090f2d0c5ab8c570d9cf2e2e3535dbdbf that needs to be set for system with more than 4GB of physical memory. Sponsored by: The FreeBSD Foundation (cherry picked from commit 0881eb9665dbfc8a53d9914a9dca1f0473ee1acb) --- share/man/man4/rtw88.4 | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/share/man/man4/rtw88.4 b/share/man/man4/rtw88.4 index b34fbf96c5df..0ace002e4bde 100644 --- a/share/man/man4/rtw88.4 +++ b/share/man/man4/rtw88.4 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 31, 2022 +.Dd May 5, 2022 .Dt rtw88 4 .Os .Sh NAME @@ -78,11 +78,27 @@ While supports all 802.11 a/b/g/n and ac the compatibility code currently only supports 802.11 a/b/g modes. Support for 802.11 n/ac is to come. +.Sh LOADER TUNABLES +.Bl -tag -width indent +.It Va compat.linuxkpi.skb.mem_limit +If you are running a 64bit system with more than 4GB of main mmeory +you need to set this tunable to +.Sy 1 +in +.Xr loader.conf 5 +and reboot once to make it effective. +This tunable will work around a problem with DMA and limit allocations +for network buffer memory to the lower 32bit of physical memory and +make the driver work. +.El .Sh BUGS Certainly. .Pp Does not seem to work (reliably) on machines with more than 4GB of main memory. +See in the +.Sx LOADER TUNABLES +section above. .Sh SEE ALSO .Xr rtw88fw 4 , .Xr wlan 4 ,
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