Date: Thu, 4 Feb 2016 16:00:30 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: Adrian Chadd <adrian.chadd@gmail.com>, "stable@freebsd.org" <stable@freebsd.org> Subject: Re: 82576 + NETMAP + VLAN Message-ID: <20160204130029.GC88527@zxy.spb.ru> In-Reply-To: <20160202204446.GQ88527@zxy.spb.ru> References: <20151018185639.GF42243@zxy.spb.ru> <CAJ-VmonO8ok=twgBGVMBiAs=AyRs4LUoDX6pGBtWStvndGKGzg@mail.gmail.com> <20151018210049.GT6469@zxy.spb.ru> <CAJ-Vmonfxz5vjVHqp6gS97mhnU10SLgohRA35O8MQLUzHvcsrw@mail.gmail.com> <20151022163519.GF6469@zxy.spb.ru> <CAJ-Vmok56uBJgJh4Bwr7yjNwsigU=ySBJ08H26caODAAxXNLRA@mail.gmail.com> <CA%2BhQ2%2Bg0ggpS%2BE5nOpON66efs7cwsed=NvaKa=mzsg6FycGhiQ@mail.gmail.com> <20160202204446.GQ88527@zxy.spb.ru>
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On Tue, Feb 02, 2016 at 11:44:47PM +0300, Slawa Olhovchenkov wrote: > On Thu, Oct 22, 2015 at 11:24:53AM -0700, Luigi Rizzo wrote: > > > On Thu, Oct 22, 2015 at 11:12 AM, Adrian Chadd <adrian.chadd@gmail.com> wrote: > > > On 22 October 2015 at 09:35, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote: > > >> On Sun, Oct 18, 2015 at 07:45:52PM -0700, Adrian Chadd wrote: > > >> > > >>> Heh, file a bug with luigi; it should be defined better inside netmap itself. > > >> > > >> I am CC: luigi. > > >> > > >> Next question: do kevent RX/TX sync? > > >> In my setup I am need to manual NIOCTXSYNC/NIOCRXSYNC. > > > > > > Hi, > > > > > > Nope. kqueue() doesn't do the implicit sync like poll() does; it's > > > just the notification path. > > > > actually not. When the file descriptor is registered there > > is an implicit sync, and there is another one when an event > > is posted for the file descriptor. > > > > unless there are bugs, of course. > > I found strange behaivor: > > 1. open netmap and register in main thread > 2. kevent register in different thread > 3. result: got event by kevent but no ring sinc (all head,tail,cur > still 0). > > Is this normal? Or is this bug? > > open and registering netmap in same thread as kevent resolve this. Also, kevent+netmap deadlocked for me: PID TID COMM TDNAME KSTACK 1095 100207 addos - mi_switch+0xe1 sleepq_catch_signals+0xab sleepq_timedwait_sig+0x10 _sleep+0x238 kern_nanosleep+0x10e sys_nanosleep+0x51 amd64_syscall+0x40f Xfast_syscall+0xfb 1095 100208 addos worker#0 mi_switch+0xe1 sleepq_catch_signals+0xab sleepq_wait_sig+0xf _sleep+0x27d kern_kevent+0x401 sys_kevent+0x12a amd64_syscall+0x40f Xfast_syscall+0xfb 1095 100209 addos worker#1 mi_switch+0xe1 turnstile_wait+0x42a __mtx_lock_sleep+0x26b knote+0x38 freebsd_selwakeup+0x8b netmap_notify+0x55 netmap_pipe_txsync+0x156 netmap_poll+0x400 netmap_knrw+0x6e kqueue_register+0x799 kern_kevent+0x158 sys_kevent+0x12a amd64_syscall+0x40f Xfast_syscall+0xfb 1095 100210 addos worker#2 mi_switch+0xe1 sleepq_catch_signals+0xab sleepq_wait_sig+0xf _sleep+0x27d kern_kevent+0x401 sys_kevent+0x12a amd64_syscall+0x40f Xfast_syscall+0xfb 1095 100211 addos worker#NOIP mi_switch+0xe1 sleepq_catch_signals+0xab sleepq_wait_sig+0xf _sleep+0x27d kern_kevent+0x401 sys_kevent+0x12a amd64_syscall+0x40f Xfast_syscall+0xfb 1095 100212 addos balancer mi_switch+0xe1 turnstile_wait+0x42a __mtx_lock_sleep+0x26b knote+0x38 freebsd_selwakeup+0x8b netmap_notify+0x2a netmap_pipe_rxsync+0x54 netmap_poll+0x774 netmap_knrw+0x6e kern_kevent+0x5cc sys_kevent+0x12a amd64_syscall+0x40f Xfast_syscall+0xfb
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