On 04/26/2016 02:24 PM, Pankaj Gupta wrote:
> Hi Jason,
>
> Overall patches look good. Just one doubt I have is below:
>> We use spinlock to synchronize the work list now which may cause
>> unnecessary contentions. So this patch switch to use llist to remove
>> this contention. Pktgen tests shows about 5% improvement:
>>
>> Before:
>> ~1300000 pps
>> After:
>> ~1370000 pps
>>
>> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
>> ---
>> drivers/vhost/vhost.c | 52
>> +++++++++++++++++++++++++--------------------------
>> drivers/vhost/vhost.h | 7 ++++---
>> 2 files changed, 29 insertions(+), 30 deletions(-)
[...]
>> - if (work) {
>> + node = llist_del_all(&dev->work_list);
>> + if (!node)
>> + schedule();
>> +
>> + node = llist_reverse_order(node);
> Can we avoid llist reverse here?
>
Probably not, this is because:
- we should process the work exactly the same order as they were queued,
otherwise flush won't work
- llist can only add a node to the head of list.
Thanks
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