netdev - Re: 3.14 regression: huge latency in read/select on tun

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Message-ID: <1396533026.12330.9.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 03 Apr 2014 06:50:26 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ortwin Glück <odi@....ch>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 3.14 regression: huge latency in read/select on tun

On Thu, 2014-04-03 at 06:19 -0700, Eric Dumazet wrote:

> It seems TSO support is broken.

If bug is in tun.c you have this list of changes  you could bisect
from :

# git log --oneline v3.13..v3.14 drivers/net/tun.c
6671b2240c54 tun: remove bogus hardware vlan acceleration flags from vlan_features
99932d4fc03a netdevice: add queue selection fallback handler for ndo_select_queue
93e14b6d776e tun: add device name(iff) field to proc fdinfo entry
fa35864e0bb7 tuntap: Fix for a race in accessing numqueues
0a379e21c503 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
fbe4d4565bad tun, rfs: fix the incorrect hash value
9bc8893937c8 tun: Add support for RFS on tun flows
143c90549494 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
3958afa1b272 net: Change skb_get_rxhash to skb_get_hash
42404c091510 Revert "tun: remove useless codes in tun_chr_aio_read() and tun_recvmsg()"
73713357ab58 tun: remove useless codes in tun_chr_aio_read() and tun_recvmsg()
34f9f437104b Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
f96eb74c84eb tun: remove unused parameter in tun_do_read()
92d4ea6e412a tun: spelling fixes


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