Re: [patch 2/2] backport of sba sg list management to ccio-dma

Joel Soete <[email protected]> Thu, 01 Nov 2007 17:18:01 +0000
Newsgroups gmane.linux.ports.hppa
Message-ID <[email protected]>
Grant,

Just come back here because I don't understand this strange stuff:

Grant Grundler wrote:
[snip]
> ...
>  #ifdef CCIO_SEARCH_TIME
> +	udelay(100);
> 
> Did you want to keep udelay() call?
> 
here is short test:
without udelay:
# scp vmlinux  jso@patst007:/var/tmp/vmlinux-2.6.23-pa-d32up3
Password:
vmlinux                                                                                    100% 4364KB 101.5KB/s   00:43

with udelay:
# scp vmlinux  jso@patst007:/var/tmp/vmlinux-2.6.23-pa-d32up3
Password:
vmlinux                                                                                    100% 4364KB 436.4KB/s   00:10

well still far from what we could expect (about 800KB/s) but fwiw something supposing slowdown the kernel improve nic perf?