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Message-ID: <670794146059f85a30efd7cf9d6650375d987077.camel@gmail.com>
Date: Mon, 23 Sep 2024 11:43:16 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Manu Bretelle <chantr4@...il.com>, dhowells@...hat.com
Cc: asmadeus@...ewreck.org, ceph-devel@...r.kernel.org,
 christian@...uner.io,  ericvh@...nel.org, hsiangkao@...ux.alibaba.com,
 idryomov@...il.com,  jlayton@...nel.org, linux-afs@...ts.infradead.org,
 linux-cifs@...r.kernel.org,  linux-erofs@...ts.ozlabs.org,
 linux-fsdevel@...r.kernel.org,  linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-nfs@...r.kernel.org,  marc.dionne@...istor.com,
 netdev@...r.kernel.org, netfs@...ts.linux.dev,  pc@...guebit.com,
 smfrench@...il.com, sprasad@...rosoft.com, tom@...pey.com, 
 v9fs@...ts.linux.dev, willy@...radead.org
Subject: Re: [PATCH v2 19/25] netfs: Speed up buffered reading

On Mon, 2024-09-23 at 11:34 -0700, Manu Bretelle wrote:

[...]

> The qemu command invoked by vmtest is:
> 
> qemu-system-x86_64 "-nodefaults" "-display" "none" "-serial" "mon:stdio" \
>   "-enable-kvm" "-cpu" "host" "-qmp" "unix:/tmp/qmp-971717.sock,server=on,wait=off" \
>   "-chardev" "socket,path=/tmp/qga-888301.sock,server=on,wait=off,id=qga0" \
>   "-device" "virtio-serial" \
>   "-device" "virtserialport,chardev=qga0,name=org.qemu.guest_agent.0" \
>   "--device" "virtio-serial" \
>   "-chardev" "socket,path=/tmp/cmdout-508724.sock,server=on,wait=off,id=cmdout" \
>   "--device" "virtserialport,chardev=cmdout,name=org.qemu.virtio_serial.0" \
>   "-virtfs" "local,id=root,path=/,mount_tag=/dev/root,security_model=none,multidevs=remap" \
>   "-kernel" "/data/users/chantra/linux/arch/x86/boot/bzImage" \
>   "-no-reboot" "-append" "rootfstype=9p rootflags=trans=virtio,cache=mmap,msize=1048576 rw earlyprintk=serial,0,115200 printk.devkmsg=on console=0,115200 loglevel=7 raid=noautodetect init=/tmp/vmtest-init4PdCA.sh panic=-1" \
>   "-virtfs" "local,id=shared,path=/data/users/chantra/linux,mount_tag=vmtest-shared,security_model=none,multidevs=remap" \
>   "-smp" "2" "-m" "4G"

fwiw: removing "cache=mmap" from "rootflags" allows VM to boot and run tests.


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