Date: Thu, 14 Dec 2000 13:16:09 +0100 (CET) From: Marius Bendiksen <mbendiks@eunet.no> To: Matt Dillon <dillon@earth.backplane.com> Cc: Julian Elischer <julian@elischer.org>, Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>, arch@FreeBSD.ORG Subject: Re: Even 1GB KVA is not enough, but we have no more space Message-ID: <Pine.BSF.4.05.10012141314080.43757-100000@login-1.eunet.no> In-Reply-To: <200012140655.eBE6tmP92001@earth.backplane.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> We're probably not going to ever do anything like this, because > manipulating page directory entries or the whole VM space on a > user->supervisor or supervisor->user transition flushes > the TLB and seriously degrades performance. Hence my reference to doing this on-demand. If the kernel could be taught about virtual/physical paging issues (ie. could be aware of whether objects are currently in the KV space), then you could avoid this except in the few cases where you hit the 1G limit. Marius To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.05.10012141314080.43757-100000>