Date: Tue, 15 Oct 2024 21:20:03 +0900 From: Tomoaki AOKI <junchoon@dec.sakura.ne.jp> To: void <void@f-m.fm> Cc: freebsd-hackers@freebsd.org Subject: Re: polling interval Message-ID: <20241015212003.888c87d24bf6ec6dfc3fc549@dec.sakura.ne.jp> In-Reply-To: <Zw5DI8zBIXLSAX88@vm2> References: <Zw0Ez-zyTg9oodi8@int21h> <20241015000117.8a731ab66a1af876879f5ca8@dec.sakura.ne.jp> <Zw1WKr6uVYiHEPi0@int21h> <9513c9d9-8f7c-4842-a535-b387082e4e3e@sentex.net> <Zw2xTp3RH5fhlBib@int21h> <20241015174135.14866b319a49ddafeca6e3bb@dec.sakura.ne.jp> <Zw5DI8zBIXLSAX88@vm2>
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On Tue, 15 Oct 2024 11:25:39 +0100 void <void@f-m.fm> wrote: > On Tue, Oct 15, 2024 at 05:41:35PM +0900, Tomoaki AOKI wrote: > > >FYI, I'm configuring kern.hz=4096 in /boot/loader.conf. Lost where I've > >seen, but recommended by somewhere. > > all offloading at source, host and destination turned off, default kern.hz in vm > ================================================================================ > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-60.06 sec 4.46 GBytes 637 Mbits/sec 1326 sender > [ 5] 0.00-60.07 sec 4.45 GBytes 637 Mbits/sec receiver > > same as above, but with kern.hz=8 > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-60.02 sec 4.45 GBytes 637 Mbits/sec 1148 sender > [ 5] 0.00-60.02 sec 4.45 GBytes 637 Mbits/sec receiver > > as above, kern.hz=4096 > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-60.07 sec 3.09 GBytes 441 Mbits/sec 1013 sender > [ 5] 0.00-60.07 sec 3.09 GBytes 441 Mbits/sec receiver > > With all offloading turned off, not seeing incorrect checksums at the > destination now. > -- Maybe kern.hz=4096 would be too large (short time per tick) for your VMs, as VMs basically need more time than bare metal for emulated (virtualized) syscalls or some instructions by mature. And possibly (as I don't use offloading on VirtualBox that is the only VM I tried) interactions between host (emulated hardware) and guests about offloading has some issues. -- Tomoaki AOKI <junchoon@dec.sakura.ne.jp>
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