From: Oliver Neukum <oliver@neukum.org>
To: Markus Rechberger <mrechberger@gmail.com>
Cc: "Greg Kroah-Hartman" <gregkh@suse.de>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Increase usbfs bulk buffer size
Date: Wed, 17 Aug 2011 19:14:52 +0200 [thread overview]
Message-ID: <201108171914.52257.oliver@neukum.org> (raw)
In-Reply-To: <CA+O4pCKfWLP+ohfUVi811CRbmrb2FyoMwkmxxGJ1TF2kKtGDEA@mail.gmail.com>
Am Mittwoch, 17. August 2011, 19:07:01 schrieb Markus Rechberger:
> Hi,
>
> this patch increases the maximum buffersize for bulk transfers, our
> devices support at least up to 46k bytes for bulk transfers.
> This patch allows us to lower the iterations between kernel and
> userspace and lower the system pressure.
You must not do this. It increases memory pressure too much
by forcing very high order allocations. If your problem is really
the number of syscalls, you must implement scatter/gather.
Regards
Ôliver
next prev parent reply other threads:[~2011-08-17 17:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-17 17:07 [PATCH] Increase usbfs bulk buffer size Markus Rechberger
2011-08-17 17:14 ` Oliver Neukum [this message]
2011-08-17 17:44 ` Markus Rechberger
2011-08-19 6:23 ` Oliver Neukum
2011-08-19 10:45 ` Markus Rechberger
2011-08-31 6:57 ` Markus Rechberger
2011-09-12 10:18 ` Markus Rechberger
2011-09-12 10:25 ` Markus Rechberger
2011-09-12 11:33 ` Greg KH
2011-09-12 12:14 ` Markus Rechberger
2011-09-12 14:07 ` Alan Stern
2011-08-18 18:37 ` Greg KH
2011-08-18 19:13 ` Markus Rechberger
2011-08-19 5:26 ` Greg KH
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