From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [Bluez-devel] hci_acl_tx_to: hci0 ACL tx timeout From: Marcel Holtmann To: James Cameron Cc: BlueZ Mailing List In-Reply-To: <20040630120249.GH30504@hp.com> References: <20040630112137.GE30504@hp.com> <1088595657.4540.19.camel@pegasus> <20040630120249.GH30504@hp.com> Content-Type: text/plain Message-Id: <1088599419.4540.24.camel@pegasus> Mime-Version: 1.0 Sender: bluez-devel-admin@lists.sourceforge.net Errors-To: bluez-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Date: Wed, 30 Jun 2004 14:43:39 +0200 Hi James, > > I can't give you a definitv answer for that problem, but it seems that > > some Bluetooth dongles are not working very nice under heavy load. This > > is actually not a chip problem, because I saw chips working in one > > dongle and in another one it produces such timeouts. > > Thanks. I saw a load correlation before, but not with 2.6.6. I really think this is buggy hardware in the USB dongle or in the USB host controller. Maybe it is also only a software problem and related to the USB subsystem. I don't know. > > You can of course try to increase the ACL tx timeout and see if it still > > occurs. > > Oh! How can I increase that? I've checked hcitool and hciconfig man > pages, and found how to change MTU and buffer size. Forget about that comment. I checked the kernel code and I don't think that increasing the timeout to more than 45 seconds makes sense. /* ACL tx timeout must be longer than maximum * link supervision timeout (40.9 seconds) */ if (!hdev->acl_cnt && (jiffies - hdev->acl_last_tx) > (HZ * 45)) hci_acl_tx_to(hdev); > > Do all of your dongles use the same Bluetooth chip? > > Both dongles were purchased from the same source, and both look > identical apart from the ba. > > I'm not sure how to get the identity of the chip, but hciconfig -a says > at the end ... > > Manufacturer: Cambridge Silicon Radio (10) If it is CSR based you can try "hciconfig hci0 revision". Regards Marcel ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com _______________________________________________ Bluez-devel mailing list Bluez-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-devel