From: "Ortwin Glück" <odi@odi.ch>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: 3.14 regression: huge latency in read/select on tun
Date: Fri, 04 Apr 2014 10:34:11 +0200 [thread overview]
Message-ID: <533E6E83.7030106@odi.ch> (raw)
In-Reply-To: <1396533026.12330.9.camel@edumazet-glaptop2.roam.corp.google.com>
On 03.04.2014 15:50, Eric Dumazet wrote:
> 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
That list doesn't look too promising. I'd rather look in net/ipv4 which
does have TSO/GSO related changes. I tried to bisect that but the system
hangs on boot when net devices are enabled. So it may prove difficult to
pin down. I may try again during the weekend.
next prev parent reply other threads:[~2014-04-04 8:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-02 16:17 3.14 regression: huge latency in read/select on tun Ortwin Glück
2014-04-02 16:42 ` Eric Dumazet
2014-04-03 7:52 ` Ortwin Glück
2014-04-03 13:19 ` Eric Dumazet
2014-04-03 13:50 ` Eric Dumazet
2014-04-04 8:34 ` Ortwin Glück [this message]
2014-04-19 20:13 ` Ortwin Glück
2014-04-20 16:31 ` Eric Dumazet
2014-04-21 8:40 ` Ortwin Glück
2014-04-21 11:13 ` Lukas Tribus
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