Messages in this thread | | | Date | Thu, 20 Mar 2008 12:35:43 +0100 | From | Rene Herman <> | Subject | Re: ehci-hcd affects hda speed |
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On 20-03-08 06:08, Alessandro Suardi wrote:
> On Thu, Mar 20, 2008 at 1:31 AM, Rene Herman <rene.herman@keyaccess.nl> wrote:
>> I do wonder -- is your hda throughput also the same before _ever_ attaching >> anything to the EHCI controller and after? In my case, the slow down only >> happened after switching on my external USB drive once, and would persist >> from that time until reboot (or unloading ehci-hcd, which I kept modular for >> exactly that reason). >> >> The sleep time wasn't the core problem, so I wonder of later VIA chips do >> still have the active async schedule problem... >> >> Alessandro? You said there still was a difference for you between no EHCI at >> all and EHCI after tweaking 4B as Lev showed. How much? > > When used setpci to tweak the setting, my hdparm -t went > from 17 to 25MB/s on /dev/hda. > > With your patch applied, now after booting it says 33MB/s for > hda and 37MB/s on hdb (and I can burn DVDs at a stable 6x > now, while growisofs backed off to 4x in less than a minute > before the patch). > > If the patch does exactly what setpci did, then perhaps I had > other activity on hda at the moment I ran the test...
Yes, should be the exact same. It could be what I noted -- that you have the 33/37 just after booting, and a drop to 25 again after having switched on/used a EHCI device for the first time? That would be interesting.
Rene.
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