Messages in this thread | | | From | "John Newbie" <> | Subject | Re: ide drives performance issues, maybe related with buffer cache. | Date | Fri, 15 Aug 2003 19:39:43 +0400 |
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> > So question is : why when i am copying file from one HD to another (for > > simplicity from /hda to /hdb) > > the speed fall down ? Starting from about 27-30 MB/s (drives are in >UDMA-4, > > hdparm -X68) it drops > > down to 11-12 MB/s after 4-5s. In *indows transfer rate is almost >constant > > and about 20-22 MB/s (same hardware). Why the h#ll we suck? > > I feel that it's due to buffer cache, because when you use sync (while > > copying) transfer rate is so small or even 0. > > Drives are tuned with hdparm to highest transfer rates, readahead, >multiple > > sector count (hdparm > > for details). > > Tried different filesystems, from classic ext2/3 to modern xfs/reiserfs. >The > > same results. > > Pure kernel from kernel.org (2.4.{19,20,21}), vendors kernels - all the
>How do you copy files? cp? dd? Midnight Commander? ;) >Does it happen with SCSI? >-- >vda
I've used cp & Midnight Commander (mc). Also when someone uploads big file on server through samba, speed sometimes fall down to zero.
Have no idea about scsi, drives are IDE.
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