From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 29 Mar 2001 09:52:32 +0100 Subject: Re: Sound skips From: "Iain Sandoe" To: Giuliano Pochini Cc: linuxppc-dev@lists.linuxppc.org Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Message-Id: <20010329085335.527C32EFCE@apollo.valhalla.net> Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: >> >> You might want to try Andrew Morton's Low-Latency patch (URL: >> >> http://www.uow.edu.au/~andrewm/linux/schedlat.html#downloads) > > Done. It doen't make a lot difference, but I can compile stuff without > sound interruptions most of the time OK. So nothing much has changed since I last tried it - note that those patches take scheduling latency below 1ms on x86. maybe we do have some IRQ blocking as well (I haven't had time to benchmark that at 2.4.x - it's on the TODO list). >(if it doesn't involve libtool). hmmm. Have you got any idea what libtool does that is different? (does strace work at the moment?) mmap-ing files is "bad news" even with the LL patches (IIRC). > I tried to lower the fragment size to 9 (512B==0.012s) and it skips > even when the system is completely idle. I don't know what UI you are using but... does this occur each second (i.e. related to, for example, updating a clock on screen) ... or every 20/30 seconds or so - perhaps related to sync() ? --- ah well, we'll solve it eventually [otherwise PPC is dead for sound - which would be a Great Shame (tm).] ciao, Iain. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/