[dpdk-dev] [PATCH] vhost: flush used->idx update before reading avail->flags
Luke Gorrie
luke at snabb.co
Fri Apr 24 09:27:19 CEST 2015
On 24 April 2015 at 03:01, Linhaifeng <haifeng.lin at huawei.com> wrote:
> If not add memory fence what would happen? Packets loss or interrupt
> loss?How to test it ?
>
You should be able to test it like this:
1. Boot two Linux kernel (e.g. 3.13) guests.
2. Connect them via vhost switch.
3. Run continuous traffic between them (e.g. iperf).
I would expect that within a reasonable timeframe (< 1 hour) one of the
guests' network interfaces will hang indefinitely due to a missed interrupt.
You won't be able to reproduce this using DPDK guests because they are not
using the same interrupt suppression method.
This is a serious real-world problem. I wouldn't deploy the vhost
implementation without this fix.
Cheers,
-Luke
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