1024/4096 buffer cache buffer size

Marc SCHAEFER (schaefer@alphanet.ch)
30 Aug 1998 15:12:30 +0200

[This is a repost since I think my messages where filtered by the
list because of incorrect To: information. This should be fixed
now]

Hi,

any reason why ide (drivers/blocks/hd.c) has 4096-sized
buffers and SCSI disks (drivers/scsi/sd.c) have 1024 ?

also, is there any provision for implementing partially filled
buffers blocks in the kernel ? Ie, if you do a write of
512 bytes in a device whose buffer cache block size is greater
than 512, you get first a read of that block, then the copy_from_user(),
then the write.

With IDE you get
read(4096)
write(4096)
for each partial operation whose data is not yet in the cache.

thanks for any comments.

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