Date: Tue, 24 Aug 1999 02:27:44 -0500 From: "Geocrawler.com" <archiver@db.geocrawler.com> To: freebsd-scsi@freebsd.org Subject: The I/O is too slow than linux Message-ID: <199908240727.CAA14695@db.geocrawler.com>
next in thread | raw e-mail | index | archive | help
This message was sent from Geocrawler.com by "liudong" <shift@263.net> Be sure to reply to that address. some of dmesg output: ..... ahc0: aic7896/97 Wide Channel A, SCSI Id=7, 16/255 SCBs ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter> rev 0x00 int a irq 19 on pci0.12.1 ahc1: aic7896/97 Wide Channel B, SCSI Id=7, 16/255 SCBs ...... Waiting 5 seconds for SCSI devices to settle pass4 at ahc1 bus 0 target 6 lun 0 pass4: <ESG-SHV SCA HSBP M6 0.61> Fixed Processor SCSI-2 device pass4: 3.300MB/s transfers da0 at ahc0 bus 0 target 0 lun 0 da0: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled da0: 17501MB (35843520 512 byte sectors: 255H 63S/T 2231C) da1 at ahc0 bus 0 target 0 lun 1 da1: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled da1: 35003MB (71687040 512 byte sectors: 255H 63S/T 4462C) da2 at ahc0 bus 0 target 0 lun 2 da2: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device da2: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled da2: 17501MB (35843520 512 byte sectors: 255H 63S/T 2231C) changing root device to da0s1a da3 at ahc1 bus 0 target 1 lun 0 da3: <IBM DNES-318350Y SA30> Fixed Direct Access SCSI-3 device da3: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing Enabled da3: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C) ffs_mountfs: superblock updated for soft updates ffs_mountfs: superblock updated for soft updates then run ... # time dd if=/dev/da0 of=/dev/null count=200000 200000+0 records in 200000+0 records out 102400000 bytes transferred in 36.852771 secs (2778624 bytes/sec) real 0m36.911s user 0m0.372s sys 0m5.982s The same computer in linux(2.2.5): # time dd if=/dev/sda of=/dev/null count=200000 200000+0 records in 200000+0 records out 0.52user 2.29system 0:09.05elapsed 31%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (89major+13minor)pagefaults 0swaps What is the problem!!?? Geocrawler.com - The Knowledge Archive To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199908240727.CAA14695>