similar to: Possible memdisk issue

On 07/08/2014 05:55 PM, H. Peter Anvin wrote: > On 07/08/2014 03:05 PM, Alexander Perlis wrote: >> >> Question: what's special about the transition from 8203KiB to 8204KiB? >> Both have CHS=8/64/32 and both involve a fractional end cylinder. > > Fractional cylinders with floppy disks is almost certainly a very bad thing. > Agreed, but that doesn't appear to

Hi there I am analyzing disk performance. I'm testing raw (tap: aio) and lvm (phy :). The tests I'm doing on a SLES11SP3, cpu I7, 4GBRam, disco-SATAII 7200rpm. With phy: lvm achievement 70-80MiB / s (an acceptable value) With tap: aio: file.raw achievement 5-9MiB / s, which is very low ... 10MiB / s is what you should expect access to a tap: aio: file.raw? or I have something

On 07/08/2014 03:05 PM, Alexander Perlis wrote: > > Question: what's special about the transition from 8203KiB to 8204KiB? > Both have CHS=8/64/32 and both involve a fractional end cylinder. > Fractional cylinders with floppy disks is almost certainly a very bad thing. -hpa

On 07/08/2014 04:42 PM, Alexander Perlis wrote: > On 07/08/2014 05:55 PM, H. Peter Anvin wrote: >> On 07/08/2014 03:05 PM, Alexander Perlis wrote: >>> >>> Question: what's special about the transition from 8203KiB to 8204KiB? >>> Both have CHS=8/64/32 and both involve a fractional end cylinder. >> >> Fractional cylinders with floppy disks is