Re: [Virtio-fs] [PATCH] virtiofsd: Use --thread-pool-size=0 to mean no thread pool

[Venegas Munoz, Jose Carlos]

For all the cases the memory for the guest is 2G.


On 17/11/20 12:55, "Vivek Goyal" <vgoyal@redhat.com> wrote:

    On Tue, Nov 17, 2020 at 04:00:09PM +0000, Venegas Munoz, Jose Carlos wrote:
    > >   Not sure what the default is for 9p, but comparing
    > >   default to default will definitely not be apples to apples since this
    > >   mode is nonexistent in 9p.
    > 
    > In Kata we are looking for the best config for fs compatibility and 
performance. So even if are no apples to apples,
    > we are for the best config for both and comparing the best that each of 
them can do.
    > 
    > In the case of Kata for 9pfs(this is the config we have found has better 
performance and fs compatibility  in general) we have:
    > ```
    > -device virtio-9p-pci # device type
    > ,disable-modern=false 
    > ,fsdev=extra-9p-kataShared # attr: device id  for fsdev
    > ,mount_tag=kataShared  # attr: tag on how will be found de sharedfs 
    > ,romfile= 
    > -fsdev local  #local: Simply lets QEMU call the individual VFS functions 
(more or less) directly on host.
    > ,id=extra-9p-kataShared 
    > ,path=${SHARED_PATH} # attrs: path to share
    > ,security_model=none #    
    > #    passthrough: Files are stored using the same credentials as they are 
created on the guest. This requires QEMU to run as # root.
    > #    none: Same as "passthrough" except the sever won't report failures 
if it fails to set file attributes like ownership # 
    > #  (chown). This makes a passthrough like security model usable for 
people who run kvm as non root.
    > ,multidevs=remap
    > ```
    > 
    > The mount options are:
    > ```
    > trans=virtio 
    >     ,version=9p2000.L 
    >     ,cache=mmap 
    >     ,"nodev" # Security: The nodev mount option specifies that the 
filesystem cannot contain special devices. 
    >     ,"msize=8192" # msize: Maximum packet size including any headers.
    > ```

    How much RAM you are giving to these containers when using virtio-9p?

    Vivek