Bug 6664

Summary:	Linux performs poorly at copying large files between partitions on nForce 3 motherboard
Product:	IO/Storage	Reporter:	Artem S. Tashkinov (aros)
Component:	IDE	Assignee:	Bartlomiej Zolnierkiewicz (bzolnier)
Status:	REJECTED INVALID
Severity:	low
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.16.19	Subsystem:
Regression:	---	Bisected commit-id:

Description Artem S. Tashkinov 2006-06-08 03:34:46 UTC

Most recent kernel where this bug did not occur: not known
Distribution: FC5
Hardware Environment: CPU Sempron 3400; GigaByte K8NS Pro Motherboard; nForce3
250GB chipset; Two HDD on the same IDE channel; Two SATA drives
Software Environment:
Problem Description:

1) Copying a large file between two HDD with newly created empty FAT32
partitions on the same IDE channel gives these results (Linux runned with no
background tasks, i.e. with zero CPU load):

Windows XP SP2 with nVidia IDE drivers: ~33Mb/sec (CPU usage ~ 15%)
Linux: ~22Mb/sec (CPU usage ~ 10%)

2) The same situation but two SATA drives (empty FAT32 partitions)

Windows XP SP2 with nVidia IDE drivers: ~38Mb/sec
Linux: ~27Mb/sec

P.S. File reading on the both drives gives an average 55Mb/s throughput