Re: Question on server speed

[Warren Young <warren@xxxxxxxxxxx>]

On Aug 6, 2019, at 7:04 AM, Stephen John Smoogen <smooge@xxxxxxxxx> wrote:
> 
> On Mon, 5 Aug 2019 at 19:49, Warren Young <warren@xxxxxxxxxxx> wrote:
> 
>> On Aug 5, 2019, at 11:25 AM, Stephen John Smoogen <smooge@xxxxxxxxx>
>> wrote:
>>> 
>>> On Mon, 5 Aug 2019 at 13:17, Jerry Geis <jerry.geis@xxxxxxxxx> wrote:
>>> 
>>>> an external SSD disk USB3 connected and the machine "freezes"... Why is
>>>> that?
>>>> 
>>> You may have a motherboard which is routing a lot through a single USB
>>> controller.
>> 
>> Ridiculous if true.  Modern OSes solved the blocking I/O problem decades
>> ago.
>> 
> The OS can only do as much as the hardware allows.

Back when we had serial mice, the most common data rate was 1200 bps.  That’s 0.0012 Mbit/sec.  If your 480 Mbit/sec USB-2 or 5/10/20 Mbit/sec USB-3 bus is so jammed up that it can’t trickle through that much data per second from the mouse while an SSD on the same bus is blocked on I/O, it’s dreck hardware.
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
https://lists.centos.org/mailman/listinfo/centos