Re: [dpdk-dev] [PATCH 01/11] ixgbe: clean log messages

[Jay Rolette <rolette@infiniteio.com>]

Hi David,

The updated output is definitely an improvement, but if you'll go with the
first solution you described (adding \n in the log macro), it works much
better for products using DPDK. For developer use, I think it ends up being
a wash either way.

At least for my product (embedded network appliance), we want to capture
anything that is logging in syslog. The log macros in DPDK make that very
reasonable to do, but if there are embedded newlines, it ends up screwing
up log parsing when someone wants to process logs later.

We end up having to remove all of those newlines, which makes it harder to
merge as new releases coming out.

I'm assuming most products have similar requirements for logging. That's at
least been the case for the products I've been involved with over the years.

If the PMDs are using PMD_LOG as a replacement macro for debugging
printf's, I can see where this might be a little more pain, but having
PMD_LOG is a lot more useful it if easily integrates with central logging
facilities.

Thanks,
Jay


On Tue, Aug 26, 2014 at 9:55 AM, David Marchand <david.marchand@6wind.com>
wrote:

> Hello Jay,
>
> On Tue, Aug 26, 2014 at 4:23 PM, Jay Rolette <rolette@infiniteio.com>
> wrote:
>
>> Why are you adding newlines to log message strings? Shouldn't that be up
>> to whatever the messages end up getting routed to?
>>
>
> Actually, I wanted to have consistent log formats in the PMDs so that the
> log messages displayed at runtime are aligned (and not bouncing with \n
> before or after the log message).
> There was two solutions from my point of view :
> - either always add a \n in the log macro and remove all trailing \n
> - do the opposite
>
> I preferred the latter as it let users of the macro set the message format
> as they want.
>
>
> Before this change :
>
> Configuring Port 0 (socket 1)
> PMD: ixgbe_dev_tx_queue_setup(): sw_ring=0x7f3e59cd8080
> hw_ring=0x7f3e59d02080 dma_addr=0x727702080
>
> PMD: ixgbe_dev_tx_queue_setup(): Using simple tx code path
>
> PMD: ixgbe_dev_tx_queue_setup(): Vector tx enabled.
>
> PMD: ixgbe_dev_rx_queue_setup(): sw_ring=0x7f3e59cd57c0
> hw_ring=0x7f3e59d12080 dma_addr=0x727712080
>
> PMD: ixgbe_dev_rx_queue_setup(): Rx Burst Bulk Alloc Preconditions are
> satisfied. Rx Burst Bulk Alloc function will be used on port=0, queue=0.
>
> PMD: ixgbe_dev_rx_queue_setup(): Vector rx enabled, please make sure RX
> burst size no less than 32.
>
>
> After this change :
>
> Configuring Port 0 (socket 1)
> PMD: ixgbe_dev_tx_queue_setup(): sw_ring=0x7fd47ecd8080
> hw_ring=0x7fd47ed02080 dma_addr=0x727702080
> PMD: ixgbe_dev_tx_queue_setup(): Using simple tx code path
> PMD: ixgbe_dev_tx_queue_setup(): Vector tx enabled.
> PMD: ixgbe_dev_rx_queue_setup(): sw_ring=0x7fd47ecd57c0
> hw_ring=0x7fd47ed12080 dma_addr=0x727712080
> PMD: ixgbe_dev_rx_queue_setup(): Rx Burst Bulk Alloc Preconditions are
> satisfied. Rx Burst Bulk Alloc function will be used on port=0, queue=0.
> PMD: ixgbe_dev_rx_queue_setup(): Vector rx enabled, please make sure RX
> burst size no less than 32.
> Port 0: 90:E2:BA:29:DF:58
>
>
> --
> David Marchand
>