* Re: Improved performance by reformatting?
[not found] <20020509234806.GA4635@jensbenecke.de>
@ 2002-05-10 1:33 ` Hans Reiser
2002-05-10 1:35 ` Hans Reiser
1 sibling, 0 replies; 2+ messages in thread
From: Hans Reiser @ 2002-05-10 1:33 UTC (permalink / raw)
To: Jens Benecke; +Cc: ReiserFS Mailingliste, zam
Jens Benecke wrote:
>Hi,
>
>recently I have begun to notice that my server (Duron 650, Via chipset,
>UDMA harddisks, hdparm says 30-35MB/sec on the raw device) have been
>slowing down during long copy actions. If I copy a 300MB file, e.g.
>midnight commander pauses frequently, sometimes over ten seconds, while
>the CPU Load (according to xosview) is stuck at 100%.
>
>DMA and so on is enabled on all harddisks.
>
>The file systems in question were created with early 2.4 kernels (2.4.4
>IIRC) and one of them is a LVM volume which was resized and moved
>several times until now. Would a backup & reformat & restore noticeably
>improve performance to make it worth the effort?
>
>I'm asking this because I will have the chance to do this shortly (new
>harddisks) and if it will make a difference, I will not just copy the
>stuff over, but recreate the FS.
>
>
>
>
You need the latest bitmap.c (ask zam), and to turn off border, and turn
on skip_busy.
If I can just get some decent benchmarks, we'll determine what options
should be standard, and put this bitmap.c in the mainline kernel, but
there are delays in benchmarking....
Hans
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: Improved performance by reformatting?
[not found] <20020509234806.GA4635@jensbenecke.de>
2002-05-10 1:33 ` Improved performance by reformatting? Hans Reiser
@ 2002-05-10 1:35 ` Hans Reiser
1 sibling, 0 replies; 2+ messages in thread
From: Hans Reiser @ 2002-05-10 1:35 UTC (permalink / raw)
To: Jens Benecke; +Cc: ReiserFS Mailingliste
Jens Benecke wrote:
>Hi,
>
>recently I have begun to notice that my server (Duron 650, Via chipset,
>UDMA harddisks, hdparm says 30-35MB/sec on the raw device) have been
>slowing down during long copy actions. If I copy a 300MB file, e.g.
>midnight commander pauses frequently, sometimes over ten seconds, while
>the CPU Load (according to xosview) is stuck at 100%.
>
>DMA and so on is enabled on all harddisks.
>
>The file systems in question were created with early 2.4 kernels (2.4.4
>IIRC) and one of them is a LVM volume which was resized and moved
>several times until now. Would a backup & reformat & restore noticeably
>improve performance to make it worth the effort?
>
>I'm asking this because I will have the chance to do this shortly (new
>harddisks) and if it will make a difference, I will not just copy the
>stuff over, but recreate the FS.
>
>
>
>
using tar rather than dd to copy things will improve performance. The
repacker is scheduled for v4.1....
^ permalink raw reply [flat|nested] 2+ messages in thread