the patch has solved my problem. thanks a lot
On Wed, Apr 25, 2012 at 10:52 AM, junaid khalid <
junaid.kha...@seecs.nust.edu.pk> wrote:
> Thanks a lot. I will update you after testing it
>
>
> On Wed, Apr 25, 2012 at 10:45 AM, Ben Pfaff <b...@nicira.com> wrote:
>
>> On Wed, Apr 25, 2012 at 10:38:45AM +0500, junaid khalid wrote:
>> > we are talking about the recv failed problem (system@br0: recv failed
>> (No
>> > buffer space available)).
>>
>> Try applying the following patch from master to your tree. It may help.
>>
>> --8<--------------------------cut here-------------------------->8--
>>
>> From: Ben Pfaff <b...@nicira.com>
>> Date: Thu, 15 Mar 2012 21:15:38 -0700
>> Subject: [PATCH] netlink-socket: Increase Netlink socket receive buffer
>> size.
>>
>> Open vSwitch userspace can set up flows at a high rate, but it is somewhat
>> "bursty" in opportunities to set up flows, by which I mean that OVS sets
>> up
>> a batch of flows, then goes off and does some other work for a while, then
>> sets up another batch of flows, and so on. The result is that, if a large
>> number of packets that need flow setups come in all at once, then some of
>> them can overflow the relatively small kernel-to-user buffers.
>>
>> This commit increases the kernel-to-user buffers from the default of
>> approximately 120 kB each to 1 MB each. In one somewhat synthetic test
>> case that I ran based on an "hping3" that generated a load of about 20,000
>> new flows per second (including both requests and replies), this reduced
>> the packets dropped at the kernel-to-user interface from about 30% to
>> none.
>> I expect that it will similarly improve packet loss in workloads where
>> flow arrival is not easily predictable.
>>
>> (This has little effect on workloads generated by "ovs-benchmark rate"
>> because that benchmark is effectively "self-clocking", that is, a new flow
>> is triggered only by a reply to a request made earlier, which means that
>> the number of buffered packets at any given has a known, constant upper
>> limit.)
>>
>> Bug #10210.
>> Signed-off-by: Ben Pfaff <b...@nicira.com>
>> ---
>> include/sparse/sys/socket.h | 5 +++--
>> lib/netlink-socket.c | 10 +++++++++-
>> 2 files changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/sparse/sys/socket.h b/include/sparse/sys/socket.h
>> index 89e3c2d..1ed195b 100644
>> --- a/include/sparse/sys/socket.h
>> +++ b/include/sparse/sys/socket.h
>> @@ -1,5 +1,5 @@
>> /*
>> - * Copyright (c) 2011 Nicira Networks.
>> + * Copyright (c) 2011, 2012 Nicira Networks.
>> *
>> * Licensed under the Apache License, Version 2.0 (the "License");
>> * you may not use this file except in compliance with the License.
>> @@ -74,7 +74,8 @@ enum {
>> SO_SNDBUF,
>> SO_SNDLOWAT,
>> SO_SNDTIMEO,
>> - SO_TYPE
>> + SO_TYPE,
>> + SO_RCVBUFFORCE
>> };
>>
>> enum {
>> diff --git a/lib/netlink-socket.c b/lib/netlink-socket.c
>> index bc46235..df6f1d8 100644
>> --- a/lib/netlink-socket.c
>> +++ b/lib/netlink-socket.c
>> @@ -1,5 +1,5 @@
>> /*
>> - * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
>> + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks.
>> *
>> * Licensed under the Apache License, Version 2.0 (the "License");
>> * you may not use this file except in compliance with the License.
>> @@ -89,6 +89,7 @@ nl_sock_create(int protocol, struct nl_sock **sockp)
>> struct nl_sock *sock;
>> struct sockaddr_nl local, remote;
>> socklen_t local_size;
>> + int rcvbuf;
>> int retval = 0;
>>
>> if (!max_iovs) {
>> @@ -122,6 +123,13 @@ nl_sock_create(int protocol, struct nl_sock **sockp)
>> sock->protocol = protocol;
>> sock->dump = NULL;
>>
>> + rcvbuf = 1024 * 1024;
>> + if (setsockopt(sock->fd, SOL_SOCKET, SO_RCVBUFFORCE,
>> + &rcvbuf, sizeof rcvbuf)) {
>> + VLOG_WARN_RL(&rl, "setting %d-byte socket receive buffer failed
>> (%s)",
>> + rcvbuf, strerror(errno));
>> + }
>> +
>> retval = get_socket_rcvbuf(sock->fd);
>> if (retval < 0) {
>> retval = -retval;
>> --
>> 1.7.2.5
>>
>>
>
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