Date: Tue, 01 Nov 2005 10:09:11 -0700 From: Scott Long <scottl@samsco.org> To: Antony Mawer <fbsd-current@mawer.org> Cc: Greg 'groggy' Lehey <grog@freebsd.org>, FreeBSD-current@freebsd.org Subject: Re: Really poor performance on /dev/ttyv* only Message-ID: <4367A137.6020005@samsco.org> In-Reply-To: <4367150C.4030508@mawer.org> References: <20051101070259.GC18710@wantadilla.lemis.com> <4367150C.4030508@mawer.org>
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Antony Mawer wrote: > On 1/11/2005 6:02 PM, Greg 'groggy' Lehey wrote: > >> I've just installed -CURRENT on a Dell Inspiron 6000, and I discover >> that the keyboard response on virtual terminals (/dev/ttyv*) is very >> slow. If I keyboard repeat, the echo to the terminal is jerky, about >> 3 or 4 characters at a time with a marked delay in between. Under X >> or over the network there's no problem. Has anybody else seen this? >> The kernel isn't 100% GENERIC (I've disabled WITNESS and >> WITNESS_SKIPSPIN, for example), but I can't see anything that would >> explain this behaviour. > > > I've seen this on two FreeBSD 4.7 systems connected via a KVM (sharing > with two Windows 2003 servers)... typing at the console of them was > almost like typing via ssh on a satellite connection. Connecting via ssh > was fine, it was only locally that it was a problem. Resetting the > keyboard repeat rate on BSD had no discernible impact. > > I put it down to some sort of interaction between the KVM, the Windows > servers and FreeBSD and put up with it... > > Cheers > Antony > I have a USB KVM that violates the USB protocol and results in a storm on the USB controller once in a while. This can result in really sluggish console performance. I can imagine scenarios where PS/2 KVM could do similarily silly things with the same results. Scott
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