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[apache-talk] Re: [apache-talk] прошу помощ и в performance tuning
On Mon, 17 Jan 2005, Maxim Zotov wrote:
> On Mon, 17 Jan 2005, Igor Sysoev wrote:
>
>>> ????? ?????????? ??? ????: ??? ??????? ????????? ????????????? ?
>>> ???? ???????, ? ???? ?? ???????, ??????? ????? ???? ????????? ???
>>
>> ?? ? ?????-??, ??????????? ?????? ???????? ???????? ?????? ??? - ? ???
>> ???? ??????? ?? ??? ??? ???.
>
> ??, ? ? ?????? ???????? ?????? ? ?????? ?????? _?????_ ????????
> ?????????? ???????? ???????. ? ? ????? 0W-httpd ????? ????
> ??????????? ????????? ?????????? ?? ??????? ? ????????
> ????????, ?????? ??? ???????? ????????? ????????? ?? ?? ?????
> ???????, ?? ?? ??????, ?? ????????? ????????? ??????????
> ?????????, ? ??? ????? ?? ?????? ????.
??????, ?? FreeBSD 5.3 ? sendfile() ???????? ???? SF_NODISKIO, ??? ?????????
???????? sendfile() ?????????? EBUSY, ???? ???????? ??? ? ??????.
??? ????????? ?????????? ??? mmap()/mincore()/munmap().
>> ????????, ?? FreeBSD sendfile() ???????? ?? ????? ???????? ?
>> ??????? ???????.
? ??????, ?????? sendfile() ???????? ?? ????????, ?? ?????? ????
???????? MAXBSIZE (64?), ?????? ???????? ????????? ?????? ????????.
> ??????, ?? freebsd ????????????? ? ??????? ?????? ????? ???
> ?????????? LowWatermark (? ???????????? ??? ???? ??????, ???
> ?????? ??????, ????? ????? ?? ????????? ??????, ????????:
> 120/128). ????? sendfile ?????? ? ????? ???????? ??????? ??
> ???.
????????? ? ??????? ???????? ?????, ?????? ????????? ????? ??
SO_SNDLOWAT ?? ???????, ? ?????? ????? MAXBSIZE. ÷ ?? ?? ?????
? sendfile() SO_SNDLOWAT, ?????? 120? ??? ?????? ? 128?, ????????
? ????, ??? ????? ???????? ?? ??????? ??????? 8K, sendfile()
?????????? EAGAIN (src/sys/kern/uipc_syscalls.c):
if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) {
if (so->so_state & SS_NBIO) {
m_freem(m);
sbunlock(&so->so_snd);
splx(s);
error = EAGAIN;
goto done;
}
??? ??? ??? ?????? ??????????? ????? ?????????.
nginx, ????????? kqueue ? ????????? send_lowat, ?? ?????? SO_SNDLOWAT,
? ?????? NOTE_LOWAT, ??????? SO_SNDLOWAT ???????? ????????? (2?),
? ????????? ? ????????? ????? ???????? ? kqueue ?? ????????? NOTE_LOWAT.
????? ??????
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