From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200007282223.XAA13499@hyperion.valhalla.net> Date: Fri, 28 Jul 2000 23:19:43 +0100 Subject: IRQ Blocking Test 0.1.3 From: "Iain Sandoe" To: linuxppc-dev@lists.linuxppc.org Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Well I've applied this across the machines I've got that boot linux (still haven't commissioned the G4). Using Ben's 2.2.17pre13ben2. + IRQ_blocking patch + dmasound patch (separate message) The good news - is that it's stable & OK on G3 beige minitower, G3 Lombard 604e 9600/233 The bad news is that there are high interrupt latencies across the board: As Ben suggested would be the case, the Lombard is worst (it's the only one based on ide) but all three produce >250 us blocks quite easily (ll_rw_blk.c) and the 9600 (which *was* until two weeks ago my studio machine - quite capable of recording 12 channels of 44k audio direct to disk under MacOS) produces 400-700 us in scsi without really trying to load it. Ah well. Iain. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/