From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: [PATCH V3 1/2] RAID1: a new I/O barrier implementation to remove resync window Date: Fri, 24 Feb 2017 10:14:11 +1100 Message-ID: <87lgswqz3w.fsf@notabene.neil.brown.name> References: <1487176523-109075-1-git-send-email-colyli@suse.de> <87shnevcpr.fsf@notabene.neil.brown.name> <2f6b3d68-1536-3167-7362-78fdfa91e149@suse.de> <87shn9spsy.fsf@notabene.neil.brown.name> <87k28lshg5.fsf@notabene.neil.brown.name> <20170220070430.4mca7clpaw7kpj4j@kernel.org> <7178ADEA-6263-4FB0-95A5-96E5F71A9740@suse.de> <878tp0s7w8.fsf@notabene.neil.brown.name> <20170221174542.rer73ywil3oq26gj@kernel.org> <488f88e0-8111-a320-3abb-c6e6611a957e@suse.de> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Return-path: In-Reply-To: <488f88e0-8111-a320-3abb-c6e6611a957e@suse.de> Sender: linux-raid-owner@vger.kernel.org To: Coly Li , Shaohua Li Cc: linux-raid@vger.kernel.org, Shaohua Li , Johannes Thumshirn , Guoqing Jiang List-Id: linux-raid.ids --=-=-= Content-Type: text/plain On Thu, Feb 23 2017, Coly Li wrote: > > I tried to set up a 4 layer stacked md raid1, and reduce I/O barrier > bucket size to 8MB, running for 10 hours, there is no deadlock observed, Try setting BARRIER_BUCKETS_NR to '1' and BARRIER_UNIT_SECTOR_BITS to 3 and make sure the write requests are larger than 1 page (and have resync happen at the same time as writes). NeilBrown --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEG8Yp69OQ2HB7X0l6Oeye3VZigbkFAlivbMMACgkQOeye3VZi gbnjIhAAhRs9ozq7WnfrgS9SZsISXRr2R7lDycDN9oeezcuSPdHEd/kCDDYEfYmP /T4/OXWU0i0WnmAvHk1NcMt6ukHMoDC3ZnWb8p21gwmKqklG9L+p/QGyMTBqQ1ms TOrNRkpVlIHfsOUXxPCGo0I0Jy698TJktPr5pFO9FvtLuIkFeRAU183v3U+5xWsR /E5ph8ztb9wUWf2BmTIvQ6ouK2eXBV16m51hjEWapzqaZtCUGh7K+3EjUP7X5ok9 TfH4oqV58ez1K4AI51WE6iTCwVeNPvieCscd6+pa82gdYcZd2GQ6bWxeZCAkT8II H+R1GA/aAXa68wiehpHstkWgPaS1jeOFDEZLp6h3WBfAuXOGfBgRwY/ab7nrLJb+ JbxrSw2GxKP30DT8bm1Nq6ieqMxche5V17yfQyCZW3ZcJ0GmT+zjot6fox88m86a ntHV0orK9wVnFsE9QhYkTF1MQjbHqUo0mS0sAWc7EXbsJz1/21N1KO6zAClCs3Z8 Hp1kjNGjjdgoO2ib9xI0YiOrIXq3CqmTNTrwV06eAlHWtGH5KEkeRIxsXz56cvTp vjwboRW5Jb3xA/4ZUNAdqMwxcTuxgf56VdrR6DHWNIGnxAtV019GDtL2kxgb+DFV Cpm5IkHqVPQj/g6onpJwcT+CkPH0I6EyQozotxJZohdYegbOwS8= =ouGj -----END PGP SIGNATURE----- --=-=-=--