linux-kernel - Re: uart throughput

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Date:   Thu, 5 Apr 2018 21:19:53 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Muni Sekhar <munisekharrms@...il.com>
Cc:     linux-serial <linux-serial@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        kernelnewbies <kernelnewbies@...nelnewbies.org>
Subject: Re: uart throughput

On Thu, Apr 05, 2018 at 10:08:14PM +0530, Muni Sekhar wrote:
> Hi All,
> 
> 
> I’ve an uart hardware implemented on Xilinx FPGA image and it connects
> to host CPU(Intel based chip) on PCIe bus in Linux platform.
> 
> 
> The following parameters were fixed or varied when measuring the UART
> throughput in internal loopback mode(UART_RX and UART_TX pins were
> internally connected):
> 
> 
> •             Uart baud rate
> •             Parity Bit
> •             Stop Bit(s)
> 
> 
> The primary factor affecting UART throughput is the baud rate, apart
> from this any other factors affect the UART throughput?
> 
> For 4000000 bps uart baud rate, what should be the theoretical peak
> data throughput?

Um, you do know what "baud rate" means, right?  And how stop bits and
parity are related to a baud rate?

Throughput all depends on a whole raft of different things.  How exactly
have you measured this and where did you find any performance
bottlenecks?

thanks,

greg k-h