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    SubjectRe: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5
    At Tue, 31 Aug 2004 13:20:19 -0400,
    Lee Revell wrote:
    >
    > On Tue, 2004-08-31 at 11:17, Mark_H_Johnson@raytheon.com wrote:
    > > >I will be running some additional tests
    > > >- reducing preempt_max_latency
    > > >- running with sortirq and hardirq_preemption=0
    > > >to see if these uncover any further problems.
    > >
    > > #1 - audio driver
    > > latency: 621 us, entries: 28 (28)
    > > -----------------
    > > | task: latencytest/11492, uid:0 nice:0 policy:1 rt_prio:99
    > > -----------------
    > > => started at: snd_ensoniq_playback1_prepare+0x74/0x180
    > > => ended at: snd_ensoniq_playback1_prepare+0x11d/0x180
    > > =======>
    > > 00000001 0.000ms (+0.000ms): snd_ensoniq_playback1_prepare
    > > (snd_pcm_do_prepare)
    > > 00000001 0.014ms (+0.014ms): snd_es1371_dac1_rate
    > > (snd_ensoniq_playback1_prepare)
    > > 00000001 0.014ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_dac1_rate)
    > > 00000001 0.562ms (+0.548ms): snd_es1371_src_read (snd_es1371_dac1_rate)
    > > 00000001 0.562ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_read)
    > > 00000001 0.578ms (+0.015ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_read)
    > > 00000001 0.585ms (+0.006ms): snd_es1371_src_write (snd_es1371_dac1_rate)
    > > 00000001 0.585ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_write)
    > > 00000001 0.601ms (+0.015ms): snd_es1371_src_write (snd_es1371_dac1_rate)
    > > 00000001 0.601ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_write)
    > > 00000001 0.602ms (+0.001ms): snd_es1371_wait_src_ready
    > > (snd_es1371_dac1_rate)
    > > 00000001 0.616ms (+0.013ms): smp_apic_timer_interrupt
    > > (snd_ensoniq_playback1_prepare)
    > >
    > > or
    > >
    > > latency: 663 us, entries: 41 (41)
    > > -----------------
    > > | task: latencytest/11492, uid:0 nice:0 policy:1 rt_prio:99
    > > -----------------
    > > => started at: snd_ensoniq_playback1_prepare+0x74/0x180
    > > => ended at: snd_ensoniq_playback1_prepare+0x11d/0x180
    > > =======>
    > > 00000001 0.000ms (+0.000ms): snd_ensoniq_playback1_prepare
    > > (snd_pcm_do_prepare)
    > > 00000001 0.004ms (+0.004ms): snd_es1371_dac1_rate
    > > (snd_ensoniq_playback1_prepare)
    > > 00000001 0.005ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_dac1_rate)
    > > 00000001 0.006ms (+0.001ms): snd_es1371_src_read (snd_es1371_dac1_rate)
    > > 00000001 0.006ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_read)
    > > 00000001 0.019ms (+0.012ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_read)
    > > 00000001 0.607ms (+0.588ms): snd_es1371_src_write (snd_es1371_dac1_rate)
    > > 00000001 0.608ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_write)
    > > 00000001 0.624ms (+0.016ms): snd_es1371_src_write (snd_es1371_dac1_rate)
    > > 00000001 0.624ms (+0.000ms): snd_es1371_wait_src_ready
    > > (snd_es1371_src_write)
    > > 00000001 0.626ms (+0.001ms): snd_es1371_wait_src_ready
    > > (snd_es1371_dac1_rate)
    > > 00000001 0.639ms (+0.013ms): smp_apic_timer_interrupt
    > > (snd_ensoniq_playback1_prepare)
    >
    > Hmm, looks like the es1371 takes ~0.5 ms to set the DAC rate. The ALSA
    > team would probably be able to help. Takashi, any ideas?

    Does the attached patch fix this problem?


    Takashi

    --- linux/sound/pci/ens1370.c 25 Aug 2004 09:57:03 -0000 1.64
    +++ linux/sound/pci/ens1370.c 31 Aug 2004 18:17:45 -0000
    @@ -513,6 +513,7 @@
    r = inl(ES_REG(ensoniq, 1371_SMPRATE));
    if ((r & ES_1371_SRC_RAM_BUSY) == 0)
    return r;
    + cond_resched();
    }
    snd_printk("wait source ready timeout 0x%lx [0x%x]\n", ES_REG(ensoniq, 1371_SMPRATE), r);
    return 0;
    -
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