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SubjectRe: [PATCH -next RFC v3 0/8] improve tag allocation under heavy load
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On 4/15/22 03:10, Yu Kuai wrote:
> The single io performance(randwrite):
>
> | bs | 128k | 256k | 512k | 1m | 1280k | 2m | 4m |
> | -------- | ---- | ---- | ---- | ---- | ----- | ---- | ---- |
> | bw MiB/s | 20.1 | 33.4 | 51.8 | 67.1 | 74.7 | 82.9 | 82.9 |

Although the above data is interesting, it is not sufficient. The above
data comes from a setup with a single hard disk. There are many other
configurations that are relevant (hard disk array, high speed NVMe, QD=1
USB stick, ...) but for which no conclusions can be drawn from the above
data.

Another question is whether the approach of this patch series is the
right approach? I would expect that round-robin wakeup of waiters would
be ideal from a fairness point of view. However, there are patches in
this patch series that guarantee that wakeup of tag waiters won't happen
in a round robin fashion.

Thanks,

Bart.

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