Messages in this thread | | | Date | Sat, 12 Jul 2008 07:55:32 -0700 | From | Arjan van de Ven <> | Subject | Re: [PATCH] x86_64: fix delayed signals |
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On Sat, 12 Jul 2008 16:42:13 +0300 Török Edwin <edwintorok@gmail.com> wrote:
> On 2008-07-12 13:32, Török Edwin wrote: > > I haven't yet tried ftrace on this box, and neither did I try > > Roland's patch yet. I will try that now, and hopefuly come back > > with some numbers shortly. > > > > tip/master of today already includes Roland's patch, so I have tested > it without even knowing on the 64-bit box. > [After gathering all the traces, I wanted to repeat everything with > the patch applied, but there was no need since its already there]. > I can say that I didn't notice any difference in the delays (I still > get 24 - 30 second delays). > I also tried Linus's readdir patch, the latency is around 27 seconds > (was 30 before). I am not sure if it is an improvement, or measurement > noise. > > Also I wasn't able to reproduce the 'Ctrl+Z works faster than Ctrl+C' > symptom, perhaps it is just a coincidence: by the time I press Ctrl+Z > to interrupt, enough time has passed (30+ secs), that the same effect > would have been obtained by another Ctrl+C, or by just waiting. > > On 32-bit, I think the 2-3 seconds latency can be attributed to I/O > delays, and I think its acceptable given the slow disk (5k4 rpm sata).
I see really bad delays on 32 bit as well, but they go away for me if I do echo 4096 > /sys/block/sda/queue/nr_requests
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