Date: Mon, 6 Mar 2017 12:30:36 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Markus Rechberger <mrechberger@gmail.com> Cc: freebsd-multimedia@freebsd.org Subject: Re: What is wrong with FreeBSD and USB Support Message-ID: <9fe561d0-3d8b-8725-98d4-37c2eb094ae9@selasky.org> In-Reply-To: <CA%2BO4pCLvWi3hpLKfXiabQ6en0=PryXQC91tqeuj3VPCE8HQ_jg@mail.gmail.com> References: <CA%2BO4pCK4%2B1rE5ft4Boy_3xPdCxK31UtTQ2BYpnBUn5jxZr%2Bz_g@mail.gmail.com> <CA%2BO4pCJr5Bq-sgjzvZQB-mFRT6x7Tp3psga6f__V9Ag-=v-mhw@mail.gmail.com> <CA%2BO4pC%2Bf5xzOjENKSJu_sQeaiN3XL3WiTcRQvm4vVweQ71Xtrg@mail.gmail.com> <CA%2BO4pC%2B1t67ODF7bkyVhcojXTLnFkS28RbFAc%2Be-tjNncogMAQ@mail.gmail.com> <CA%2BO4pCLRJRFG8Sv6C=FK6myBDPdUfhNjZ88P=e1uuH2=ojB75w@mail.gmail.com> <1aff0983-deb6-2884-472c-bb1e1037275c@selasky.org> <CA%2BO4pCLLSgdFOpJvnrD_F5Zh1aOGQexjiKKSiPbpcsKWs8wgUQ@mail.gmail.com> <CA%2BO4pCLvWi3hpLKfXiabQ6en0=PryXQC91tqeuj3VPCE8HQ_jg@mail.gmail.com>
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Hi, On 03/06/17 11:53, Markus Rechberger wrote: > 1. slow usb control messages - did you already noticed that? From what I can see no USB control transfer completed no later than 1.555 milliseconds. I loaded the numbers in the trace into a spreadsheet and got the attached distribution. This is not slow. What times do you expect? The fastest XHCI can do is ~ 0.125 ms and from the analysis is appears that the USB device is NAKing a little bit, causing the extra delay. --HPS
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