From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:60335) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RkbUl-0004cE-J2 for qemu-devel@nongnu.org; Tue, 10 Jan 2012 08:12:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RkbUh-00006l-Dj for qemu-devel@nongnu.org; Tue, 10 Jan 2012 08:12:07 -0500 Received: from mx1.redhat.com ([209.132.183.28]:20209) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RkbUh-00006f-2K for qemu-devel@nongnu.org; Tue, 10 Jan 2012 08:12:03 -0500 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q0ADC23R022483 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Tue, 10 Jan 2012 08:12:02 -0500 From: Hans de Goede Date: Tue, 10 Jan 2012 14:13:07 +0100 Message-Id: <1326201188-13478-4-git-send-email-hdegoede@redhat.com> In-Reply-To: <1326201188-13478-1-git-send-email-hdegoede@redhat.com> References: <1326201188-13478-1-git-send-email-hdegoede@redhat.com> Subject: [Qemu-devel] [PATCH 4/5] usb-redir: Try to keep our buffer size near the target size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gerd Hoffmann Cc: Hans de Goede , qemu-devel@nongnu.org Before this patch we would allow the (iso) buffer to grow unlimited (and it would under certain circumstances) leading to way too high latencies for iso data streams. Signed-off-by: Hans de Goede --- usb-redir.c | 30 +++++++++++++++++++++++++++--- 1 files changed, 27 insertions(+), 3 deletions(-) diff --git a/usb-redir.c b/usb-redir.c index 9970b85..7b967a6 100644 --- a/usb-redir.c +++ b/usb-redir.c @@ -61,6 +61,7 @@ struct endp_data { uint8_t interrupt_started; uint8_t interrupt_error; uint8_t bufpq_prefilled; + uint8_t bufpq_dropping_packets; QTAILQ_HEAD(, buf_packet) bufpq; int bufpq_size; int bufpq_target_size; @@ -290,16 +291,34 @@ static void usbredir_cancel_packet(USBDevice *udev, USBPacket *p) } } -static struct buf_packet *bufp_alloc(USBRedirDevice *dev, +static void bufp_alloc(USBRedirDevice *dev, uint8_t *data, int len, int status, uint8_t ep) { - struct buf_packet *bufp = g_malloc(sizeof(struct buf_packet)); + struct buf_packet *bufp; + + if (!dev->endpoint[EP2I(ep)].bufpq_dropping_packets && + dev->endpoint[EP2I(ep)].bufpq_size > + 2 * dev->endpoint[EP2I(ep)].bufpq_target_size) { + DPRINTF("bufpq overflow, dropping packets ep %02X\n", ep); + dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 1; + } + /* Since we're interupting the stream anyways, drop enough packets to get + back to our target buffer size */ + if (dev->endpoint[EP2I(ep)].bufpq_dropping_packets) { + if (dev->endpoint[EP2I(ep)].bufpq_size > + dev->endpoint[EP2I(ep)].bufpq_target_size) { + free(data); + return; + } + dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0; + } + + bufp = g_malloc(sizeof(struct buf_packet)); bufp->data = data; bufp->len = len; bufp->status = status; QTAILQ_INSERT_TAIL(&dev->endpoint[EP2I(ep)].bufpq, bufp, next); dev->endpoint[EP2I(ep)].bufpq_size++; - return bufp; } static void bufp_free(USBRedirDevice *dev, struct buf_packet *bufp, @@ -379,6 +398,7 @@ static int usbredir_handle_iso_data(USBRedirDevice *dev, USBPacket *p, DPRINTF("iso stream started ep %02X\n", ep); dev->endpoint[EP2I(ep)].iso_started = 1; dev->endpoint[EP2I(ep)].bufpq_prefilled = 0; + dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0; } if (ep & USB_DIR_IN) { @@ -505,6 +525,10 @@ static int usbredir_handle_interrupt_data(USBRedirDevice *dev, usbredirparser_do_write(dev->parser); DPRINTF("interrupt recv started ep %02X\n", ep); dev->endpoint[EP2I(ep)].interrupt_started = 1; + /* We don't really want to drop interrupt packets ever, but + having some upper limit to how much we buffer is good. */ + dev->endpoint[EP2I(ep)].bufpq_target_size = 1000; + dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0; } intp = QTAILQ_FIRST(&dev->endpoint[EP2I(ep)].bufpq); -- 1.7.7.4