Date: Mon, 30 Mar 2015 19:17:48 +0300 From: Artem Kuchin <artem@artem.ru> To: freebsd-fs@freebsd.org Subject: Re: Little research how rm -rf and tar kill server Message-ID: <5519772C.4010106@artem.ru> In-Reply-To: <1427731759.309823.247107417.308CD298@webmail.messagingengine.com> References: <55170D9C.1070107@artem.ru> <1427727936.293597.247070269.5CE0D411@webmail.messagingengine.com> <55196FC7.8090107@artem.ru> <1427730597.303984.247097389.165D5AAB@webmail.messagingengine.com> <5519716F.6060007@artem.ru> <1427731061.306961.247099633.0A421E90@webmail.messagingengine.com> <5519740A.1070902@artem.ru> <1427731759.309823.247107417.308CD298@webmail.messagingengine.com>
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30.03.2015 19:09, Mark Felder пишет: > > On Mon, Mar 30, 2015, at 11:04, Artem Kuchin wrote: >> 30.03.2015 18:57, Mark Felder пишет: >>> On Mon, Mar 30, 2015, at 10:53, Artem Kuchin wrote: >>>> This is normal state, not under rm -rf >>>> Do you need it during rm -rf ? >>>> >>> No, but I wonder if changing the timer from LAPIC to HPET or possibly >>> one of the other timers makes the system more responsive under that >>> load. Would you mind testing that? >>> >>> You can switch the timer like this: >>> >>> sysctl kern.eventtimer.timer=HPET >>> >>> And then run some of your I/O tests >>> >> I see. I will test at night, when load goes down. >> I cannot say sure that's a right way to dig, but i will test anything :) >> >> Just to remind: untar overloads the system, but untar + sync every 120s >> does not. >> That seems very strange to me. I think the problem might be somewhere >> here. >> > I just heard from mav that there was a bottleneck in gmirror/graid with > regards to BIO_DELETE requests > Well, i have plenty of CPU power left if you look at TOP screenshots. But i will try this patch too. If i update sources of 10-STABLE and rebuild world will this patch be there? But still, this does not explain why untar need fsync to pay nice. Artem
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