Re: [issue1116] HAMMER:file read speed

[YONETANI Tomokazu <qhwt+dfly@xxxxxxxxxx>]

Ok, I had to confirm something before asking you to do anything:
are you downloading a 100Mbyte from a DragonFly FTP server, and
talking about the difference in the transfer rate between when
the filesystem from which ftpd reads is UFS or HAMMER? (which is
what I assumed)  If so, your result below lacks the comparison between
reading from DragonFly UFS and reading from DragonFly HAMMER.  Instead,
you're comparing sequential read rate between DragonFly and FreeBSD7.

On Tue, Aug 12, 2008 at 09:51:01AM +0800, lhmwzy wrote:
> on DF:
> dd if=src.tar.gz of=/dev/null
> 189612+1 records in
> 189612+1 records out
> 97081686 bytes transferred in 2.343634 secs (41423571 bytes/sec)
> 
> dd if=src.tar.gz of=/dev/null bs=4k
> 23701+1 records in
> 23701+1 records out
> 97081686 bytes transferred in 0.359248 secs (270235901 bytes/sec)
> 
> dd if=src.tar.gz of=/dev/null bs=8k
> 11850+1 records in
> 11850+1 records out
> 97081686 bytes transferred in 0.201687 secs (481348025 bytes/sec)
> 
> dd if=src.tar.gz of=/dev/null bs=16k
> 5925+1 records in
> 5925+1 records out
> 97081686 bytes transferred in 0.121297 secs (800362656 bytes/sec)
> 
> on FB7:
> 
> dd if=src.tar.gz of=/dev/null
> 189612+1 records in
> 189612+1 records out
> 97081686 bytes transferred in 0.386370 secs (251266144 bytes/sec)