On 01/29/2018 12:42 PM, Steven Whitehouse wrote: > > > > -------- Forwarded Message -------- > Subject: Re: Fedora27: NFS v4 terrible write performance, is async > working > Date: Sun, 28 Jan 2018 21:17:02 +0000 > From: Terry Barnaby <ter...@beam.ltd.uk> > To: Steven Whitehouse <swhit...@redhat.com>, Development discussions > related to Fedora <devel@lists.fedoraproject.org>, Terry Barnaby > <ter...@beam.ltd.uk> > CC: Steve Dickson <ste...@redhat.com>, Benjamin Coddington > <bcodd...@redhat.com> > > > > On 28/01/18 14:38, Steven Whitehouse wrote: >> Hi, >> >> >> On 28/01/18 07:48, Terry Barnaby wrote: >>> When doing a tar -xzf ... of a big source tar on an NFSv4 file system >>> the time taken is huge. I am seeing an overall data rate of about 1 >>> MByte per second across the network interface. If I copy a single >>> large file I see a network data rate of about 110 MBytes/sec which is >>> about the limit of the Gigabit Ethernet interface I am using. >>> >>> Now, in the past I have used the NFS "async" mount option to help >>> with write speed (lots of small files in the case of an untar of a >>> set of source files). >>> >>> However, this does not seem to speed this up in Fedora27 and also I >>> don't see the "async" option listed when I run the "mount" command. >>> When I use the "sync" option it does show up in the "mount" list. >>> >>> The question is, is the "async" option actually working with NFS v4 >>> in Fedora27 ? No. Its something left over from v3 that allowed servers to be unsafe. With v4, the protocol defines stableness of the writes.
>>> _______________________________________________ >> >> What server is in use? Is that Linux too? Also, is this v4.0 or v4.1? >> I've copied in some of the NFS team who should be able to assist, >> >> Steve. > > Thanks for the reply. > > Server is a Fedora27 as well. vers=4.2 the default. Same issue at other > sites with Fedora27. > > Server export: "/data *.kingnet(rw,async,fsid=17)" > > Client fstab: "king.kingnet:/data /data nfs async,nocto 0 0" > > Client mount: "king.kingnet:/data on /data type nfs4 > (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,nocto,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.202.2,local_lock=none,addr=192.168.202.1)" > > This looks normal except for setting fsid=17... The best way to debug this is to open up a bugzilla report and attached a (compressed) wireshark network trace to see what is happening on the wire... The entire tar is not needed just a good chunk... steved. _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org
