Messages in this thread |  | | | Date | Wed, 25 Mar 1998 12:41:48 -0500 (EST) | | From | Mark Lehrer <> | | Subject | Cheetah vs. UDMA: Bonnie says UDMA is faster! why? |
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Hello!
I almost hate to put this on the linux-kernel list, but the newsgroups were of literally no help...
I have an NCR/Symbios 875 UW scsi controller and Cheetah 4GB hard disk. I also have a 3GB UDMA drive (WD 33200). The UDMA is / and the Cheetah is /home. This system is primarily a web server.
I am disappointed in what Bonnie has to say about performance... it claims that the UDMA edges out the Cheetah.
Below are the boot messages: it claims at the end that it is running "SLOW WIDE" instead of fast-20... that might be the entire problem. The controller comes up and says fast-20 and this is the only device on the chain so I can't blame it on an old device sharing the bus.
My question: is anyone else running this configuration? What can I do to get performance up to where it should be? Does the "syncronous transfers" section in the kernel config cause this or is it more likely to be a jumper setting on the drive?
I have the drive on the very end of the SCSI cable; could that make a difference? Thanks, Mark
-- snip, snip --
ncr53c8xx: at PCI bus 0, device 10, function 0 ncr53c8xx: 53c875 detected ncr53c875-0: rev=0x03, base=0xe5800000, io_port=0xb800, irq=10 ncr53c875-0: ID 7, Fast-20, Parity Checking ncr53c875-0: on-board RAM at 0xe5000000 ncr53c875-0: restart (scsi reset). ncr53c875-0: copying script fragments into the on-board RAM ... scsi0 : ncr53c8xx - revision 2.4a scsi : 1 host. ncr53c875-0-<0,0>: using tagged command queueing, up to 4 cmds/lun Vendor: SEAGATE Model: ST34501W Rev: 0018 Type: Direct-Access ANSI SCSI revision: 02 Detected scsi disk sda at scsi0, channel 0, id 0, lun 0 scsi : detected 1 SCSI disk total. ncr53c875-0-<0,0>: SLOW WIDE SCSI 10.0 MB/s (200 ns, offset 15) SCSI device sda: hdwr sector= 512 bytes. Sectors= 8887200 [4339 MB] [4.3 GB] -------- Kernel config NCR section:
NCR53C8XX SCSI support (CONFIG_SCSI_NCR53C8XX) [Y/n/?] detect and read serial NVRAMs (CONFIG_SCSI_NCR53C8XX_NVRAM_DETECT) [N/y/?] enable tagged command queueing (CONFIG_SCSI_NCR53C8XX_TAGGED_QUEUE) [Y/n/?] use normal IO (CONFIG_SCSI_NCR53C8XX_IOMAPPED) [N/y/?] maximum number of queued commands (CONFIG_SCSI_NCR53C8XX_MAX_TAGS) [4] synchronous transfers frequency in MHz (CONFIG_SCSI_NCR53C8XX_SYNC) [5]
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