Date: Sat, 28 Jul 2001 13:11:56 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: scsi@FreeBSD.ORG Subject: Re: DLT 4000 throughput and cstream Message-ID: <Pine.BSF.4.21.0107281231100.13594-100000@beppo> In-Reply-To: <3B630DE0.FC696BC4@progroup.com>
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[ -hardware trimmed- Only one list is needed ] > > KB/t tps MB/s > > 60.59 22 1.31 > > 60.59 22 1.31 > > 61.05 22 1.31 > > 60.62 22 1.32 > > 60.59 22 1.31 > > ... This is about half the speed you should expect. Testing with dump, w/wo cstream, is not helpful. You need to test with a non-zero data generator: yorp.feral.com > root camcontrol devlist <SEAGATE ST39175FC 0001> at scbus0 target 129 lun 0 (pass0,da0) <SEAGATE ST39175FC 0001> at scbus0 target 130 lun 0 (pass1,da1) <SEAGATE ST39175FC 0001> at scbus0 target 131 lun 0 (pass2,da2) <SUN DLT4000 CC2D> at scbus2 target 2 lun 0 (sa0,pass3) <HP C1537A L609> at scbus2 target 3 lun 0 (sa1,pass4) <TANDBERG SLR5 4/8GB =09:> at scbus2 target 6 lun 0 (sa2,pass5) yorp.feral.com > tape_pattern_tester tape_pattern_tester: [ -v ] [ -b blksize ] [ -r blocks per file ] [ -n number-of-files ] -f no-rewinding-tape-drive yorp.feral.com > tape_pattern_tester -v -b 32k -r 1000 -n 5 -f /dev/nsa0 .......Rewind Tape ........Write Pass EOT at File 4 Record 1000 Offset 32768 (163840000 total bytes written) Elapsed Seconds: 60; Data Rate: 2.6MB/s .......Rewind Tape .........Read Pass EOT at File 5 Record 0 Offset 0 (163840000 total bytes read) Elapsed Seconds: 72: Data Rate: 2.16667MB/s yorp.feral.com > tape_pattern_tester -v -b 32k -r 1000 -n 5 -f /dev/nsa1 .......Rewind Tape ........Write Pass EOT at File 4 Record 1000 Offset 32768 (163840000 total bytes written) Elapsed Seconds: 206; Data Rate: 0.757282MB/s .......Rewind Tape .........Read Pass EOT at File 5 Record 0 Offset 0 (163840000 total bytes read) Elapsed Seconds: 103: Data Rate: 1.51456MB/s yorp.feral.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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