Re: Yet another disk transfer speed problem

Bharath Krishnan (bharath@MIT.EDU)
Fri, 1 Mar 2002 14:54:51 -0500 (EST)


Hi,

Here is fdisk -l results:

[root@yakuza root]# /sbin/fdisk -l /dev/hdg

Disk /dev/hdg: 255 heads, 63 sectors, 4866 cylinders
Units = cylinders of 16065 * 512 bytes

Device Boot Start End Blocks Id System
/dev/hdg1 * 1 255 2048256 6 FAT16

[root@yakuza root]# /sbin/fdisk -l /dev/hde

Disk /dev/hde: 255 heads, 63 sectors, 1867 cylinders
Units = cylinders of 16065 * 512 bytes

Device Boot Start End Blocks Id System
/dev/hde1 1 6 48163+ 83 Linux
/dev/hde2 7 1056 8434125 83 Linux
/dev/hde3 * 1154 1867 5735205 7 HPFS/NTFS
/dev/hde4 1057 1153 779152+ f Win95 Ext'd (LBA)
/dev/hde5 1057 1153 779121 82 Linux swap

Partition table entries are not in disk order

As you can see, I have a fat16 partition on hdg. I can delete it and make
an ext3 partition there and see if that changes anything.

Thanks,

-bharath

>>>

Could you provide fdisk -l for both? For some odd reason unknown to me
some filesystems give slower results with hdparm than others, even with
the buffer-cache reads (which are intended to measure memory speed, not
drive speed, and thus should be the same for all drives on a given
mainboard). Also, hdparm directly on the drive device is often a bit
slower than hdparm for the first (outermost) partition. These problems
have been far worse in older kernels, though. With 2.2 I once
benchmarked a vfat-partition at half the speed the same partition gave
as ext2.

Holger

-bharath

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