Date: Thu, 22 Mar 2012 10:10:41 +0000 From: Alexander Best <arundel@freebsd.org> To: freebsd-hackers@freebsd.org Subject: still issues with unreadable dmesg output on SMP systems Message-ID: <20120322101041.GA99431@freebsd.org>
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hi there, a few years ago there were huge issues with SMP and dmesg output, where messages from various drivers were output to /dev/ttyv0 without any timing, which caused a lot of unreadable lines. this was fixed and almost all of the dmesg lines i see now look similar to dmesg on a non-SMP aware kernel. however there still seems to be an issue within the cd(4) driver. maybe somebody could fix the driver output to match the drivers, where the dmesg output looks correct (da(4), ada(4), ...). here's a bit of dmesg output. i'm running HEAD on amd64 btw.: ada0 at ahcich0 bus 0 scbus0 target 0 lun 0 ada0: <SAMSUNG SP2504C VT100-50> ATA-7 SATA 2.x device ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada0: Command Queueing enabled ada0: 238474MB (488395055 512 byte sectors: 16H 63S/T 16383C) ada1 at ahcich1 bus 0 scbus1 target 0 lun 0 ada1: <SAMSUNG HD103SJ 1AJ10001> ATA-8 SATA 2.x device ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada1: Command Queueing enabled ada1: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C) SMP: AP CPU #1 Launched! cd0 at ahcich2 bus 0 scbus2 target 0 lun 0 cd0: <HL-DT-ST DVTDiRmAeMc oGuHn2t4eNrS 5"0T SXCP-0l2o>w " Rfermeoqvuaebnlcey CD1-4R0O6M2 5S0C0S IH-z0 qdueavliityc e1 000 cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes) cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed Root mount waiting for: usbus7 usbus3 Root mount waiting for: usbus7 usbus3 uhub3: 6 ports with 6 removable, self powered uhub7: 6 ports with 6 removable, self powered Root mount waiting for: usbus3 ugen3.2: <Western Digital> at usbus3 umass0: <MSC Bulk-Only Transport> on usbus3 da0 at umass-sim0 bus 0 scbus6 target 0 lun 0 da0: <WD My Passport 0740 1003> Fixed Direct Access SCSI-6 device da0: 40.000MB/s transfers da0: 953837MB (1953458176 512 byte sectors: 255H 63S/T 121597C) again: apart from cd(4) all the drivers i have enabled in my kernel config produce proper dmesg lines. cheers. alex
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