Re: tty update speed regression (was: 2.6.14-rc2-mm1)

[Alexey Dobriyan <adobriyan@gmail.com>]

On Fri, Sep 23, 2005 at 10:12:11AM -0700, Nish Aravamudan wrote:
> I did not see any tty refresh problems on my TP with HZ=250 under
> 2.6.14-rc2-mm1 (excuse the typo in my previous response) under the
> adom binary you sent me. I even played two games just to make sure ;)

The slowdown is HZ dependent:
* HZ=1000 - game is playable. If I would not know slowdown is there I
  wouldn't notice it.
* HZ=100 - messages at the top are printed r e a l l y  s l o w.
* HZ=250 - somewhere in the middle.

> Is there any chance you can do an strace of the process while it is
> slow to redraw your screen?

Typical pattern is:

rt_sigaction(SIGTSTP, {SIG_IGN}, {0xb7f1e578, [], SA_RESTART}, 8) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
write(1, "\33[11;18H\33[37m\33[40m[g] Gnome\r\33[12"..., 58) = 58
rt_sigaction(SIGTSTP, {0xb7f1e578, [], SA_RESTART}, NULL, 8) = 0
rt_sigaction(SIGTSTP, {SIG_IGN}, {0xb7f1e578, [], SA_RESTART}, 8) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
write(1, "\33[12;18H\33[37m\33[40m[h] Hurthling\r"..., 62) = 62
rt_sigaction(SIGTSTP, {0xb7f1e578, [], SA_RESTART}, NULL, 8) = 0
rt_sigaction(SIGTSTP, {SIG_IGN}, {0xb7f1e578, [], SA_RESTART}, 8) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
poll([{fd=0, events=POLLIN}], 1, 0) = 0
write(1, "\33[13;18H\33[37m\33[40m[i] Orc\r\33[14d\33"..., 56) = 56
rt_sigaction(SIGTSTP, {0xb7f1e578, [], SA_RESTART}, NULL, 8) = 0
rt_sigaction(SIGTSTP, {SIG_IGN}, {0xb7f1e578, [], SA_RESTART}, 8) = 0

I can send full strace log if needed.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/