[NFS-Ganesha-Devel] Re: Scalability issue with VFS FSAL and large amounts of read i/o in flight

-----Original Message----- From: Matt Benjamin [mailto:mbenjami@redhat.com] Sent: Friday, September 14, 2018 11:01 PM To: Malahal Naineni <malahal(a)gmail.com&gt; Cc: Kropelin, Adam <kropelin(a)amazon.com>; William Allen Simpson <william.allen.simpson(a)gmail.com>; devel(a)lists.nfs-ganesha.org Subject: Re: [NFS-Ganesha-Devel] Re: Scalability issue with VFS FSAL and large amounts of read i/o in flight That's how it was when the ioq was introduced. I think Daniel has a fix in mind, but by all means, send this too. Matt On Fri, Sep 14, 2018 at 10:42 PM, Malahal Naineni <malahal(a)gmail.com&gt; wrote: > I was working with 2.5 originally and wanted to see a fix with minimal > changes. The patch was supposed to be Work In Progress but was > squashed down as I didn't have enough arguments to back it up (ended > up with a timeout patch). Now, we have systems in the lab exhibiting > this in-house and customer locations as well (I added IOQ stats and > they showed 1-second latency from queuing to calling writev alone under stress). > > I would put the IOQ in xprt itself as you did. Please post the patch > and let us review it.