From: Brice Goglin <Brice.Goglin@ens-lyon.org>
To: DervishD <lkml@dervishd.net>
Cc: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: USB Storage speed regression since 2.6.12
Date: Thu, 01 Sep 2005 13:49:37 +0200 [thread overview]
Message-ID: <4316EAD1.70300@ens-lyon.org> (raw)
In-Reply-To: <20050901113614.GA63@DervishD>
Le 01.09.2005 13:36, DervishD a écrit :
> I don't know if this is a known issue, but usb-storage speed for
> 'Full speed' devices dropped from 2.6.11.12 (more than 800Kb/s) to
> 2.6.12 (less than 250Kb/s). The problem still exists in 2.6.13.
>
> The lack of speed seems to affect only the OHCI driver. My test
> was done over a PCI USB 2.0 card, ALi chipset, OHCI driver (well
> EHCI+OHCI) and using a full speed device capable of 12MBps. The
> average measured speeds are:
>
> - 2.4.31: about 450Kb/seg
> - 2.6.11-Debian: about 800Kb/seg
> - 2.6.11.12: about 820Kb/seg
> - 2.6.12.x: about 200Kb/seg
> - 2.6.13: about 200Kb/seg
Are you mounting this storage with vfat and 'sync' option ?
IIRC, sync support for vfat was added around 2.6.12, making
write way slower since it's now really synchron.
Brice
next prev parent reply other threads:[~2005-09-01 11:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-01 11:36 USB Storage speed regression since 2.6.12 DervishD
2005-09-01 11:49 ` Brice Goglin [this message]
2005-09-01 14:49 ` DervishD
2005-09-01 16:23 ` [SOLVED] " DervishD
2005-09-01 16:31 ` Mark Lord
2005-09-01 17:29 ` DervishD
2005-09-01 12:29 ` linux-os (Dick Johnson)
2005-09-01 20:12 ` Bill Davidsen
2005-09-01 21:52 ` Andrew Morton
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