[tor-relays] Info about HW Encryption on Raspberry

[Sebastian Urbach]

Hi,

You could try to set the loglevel to "debug". As far as i can remember you 
should get that info when you restart the daemon.
--
Sincerely yours / M.f.G. / Sincères salutations

Sebastian Urbach

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Those who surrender freedom for security
will not have, nor do they deserve, either one.
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Benjamin Franklin (1706-1790)



Am 29. September 2017 14:42:14 schrieb Fr33d0m4all <fr33d0m4all at riseup.net>:

> Hi,
> I have a Raspberry Pi3 that runs a Tor mid-relay and I’ve noticed that in 
> the last weeks it reaches high temperatures (about 76°C) due to high CPU 
> usage when Tor traffic increases. It did not reach this temperature until 
> this summer (but it is not due to an higher environment temperature), so I 
> don’t know if it can be related to 0.3 version. Now I’m running Tor 
> 0.3.1.7. Should Tor 0.3.x use Raspberry Pi3 AES-NI hardware acceleration to 
> reduce high cpu usage? Is there a way to check and enable it if disabled?
>
> # openssl speed -evp aes-256-cbc
> Doing aes-256-cbc for 3s on 16 size blocks: 5560204 aes-256-cbc's in 3.00s
> Doing aes-256-cbc for 3s on 64 size blocks: 1631984 aes-256-cbc's in 3.00s
> Doing aes-256-cbc for 3s on 256 size blocks: 425826 aes-256-cbc's in 3.00s
> Doing aes-256-cbc for 3s on 1024 size blocks: 107776 aes-256-cbc's in 3.00s
> Doing aes-256-cbc for 3s on 8192 size blocks: 13489 aes-256-cbc's in 3.00s
> OpenSSL 1.0.1t  3 May 2016
> built on: Fri Jan 27 22:44:27 2017
> options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) 
> blowfish(ptr)
> compiler: gcc -I. -I.. -I../include  -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS 
> -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -g -O2 
> -fstack-protector-strong -Wformat -Werror=format-security 
> -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wa,--noexecstack -Wall 
> -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM 
> -DSHA512_ASM -DAES_ASM -DGHASH_ASM
> The 'numbers' are in 1000s of bytes per second processed.
> type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
> aes-256-cbc      29654.42k    34815.66k    36337.15k    36787.54k    36833.96k
>
> Best regards,
>    Fr33d0m4All
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